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Taupō Volcanic Zone: Difference between revisions

Coordinates: 38°40′00″S 176°01′00″E / 38.66667°S 176.01667°E / -38.66667; 176.01667
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{{Short description|Active volcanic zone in New Zealand}}
{{Short description|Active volcanic zone in New Zealand}}
{{Use New Zealand English|date=April 2023}}
{{Infobox landform
{{Infobox landform
| name = Taupō Volcanic Zone
| name = Taupō Volcanic Zone
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The '''Taupō Volcanic Zone''' ('''TVZ''') is a [[volcano|volcanic]] area in the [[North Island]] of [[New Zealand]] that has been active for the past two million years and is still highly active.
The '''Taupō Volcanic Zone''' ('''TVZ''') is a [[volcano|volcanic]] area in the [[North Island]] of [[New Zealand]]. It has been active for at least the past two million years and is still highly active.

[[Mount Ruapehu]] marks its south-western end and the zone runs north-eastward through the [[Taupō]] and [[Rotorua]] areas and offshore into the [[Bay of Plenty]]. It is part of the larger Central Volcanic Region that extends further westward through the western Bay of Plenty to the eastern side of the [[Coromandel Peninsula]] and has been active for four million years.<ref>{{cite book |last1=Cole |first1=J.W. |last2=Darby |first2=D.J. |last3=Stern |first3=T.A. |year=1995 |chapter=Taupo Volcanic Zone and Central Volcanic Region: Backarc Structures of North Island, New Zealand |editor-last=Taylor |editor-first=Brian |title=Backarc Basins: Tectonics and Magmatism |location=New York |publisher=Plenum |page=3 |isbn=978-1-4615-1843-3}}</ref> At Taupō the [[rift]] volcanic zone is widening east–west at the rate of about 8&nbsp;mm per year while at Mount Ruapehu it is only 2–4&nbsp;mm per year but this increases at the north eastern end at the Bay of Plenty coast to 10–15&nbsp;mm per year.<ref name="Rifting">{{Cite journal |last1=Villimor |first1=P. |last2=Berryman |first2=K. R. |last3=Ellis |first3=S. M. |author-link3=Susan Ellis (geophysicist) |last4=Schreurs |first4=G. |last5=Wallace |first5=L. M. |last6=Leonard |first6=G. S. |last7=Langridge |first7=R. M. |last8=Ries |first8=W. F. |date=2017-10-04 |title=Rapid Evolution of Subduction-Related Continental Intraarc Rifts: The Taupo Rift, New Zealand |url=https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017TC004715 |journal=Tectonics |language=en |volume=36 |issue=10 |pages=2250–2272 |bibcode=2017Tecto..36.2250V |doi=10.1002/2017TC004715 |s2cid=56356050|doi-access=free }}</ref> It is named after [[Lake Taupō]], the flooded [[caldera]] of the largest volcano in the zone, the [[Taupō Volcano]] and contains a large central [[North Island Volcanic Plateau|volcanic plateau]] as well as other landforms associated with its containing [[Tectonics|tectonic]] intra-arc continental [[Taupō Rift]].
[[Mount Ruapehu]] marks its south-western end and the zone runs north-eastward through the [[Taupō]] and [[Rotorua]] areas and offshore into the [[Bay of Plenty]]. It is part of a larger Central Volcanic Region that extends to the [[Coromandel Peninsula]] and has been active for four million years. The zone is contained within the [[Tectonics|tectonic]] intra-arc continental [[Taupō Rift]] and this [[rift]] volcanic zone is widening unevenly east–west, with the greatest rate of widening at the Bay of Plenty coast, the least at Mount Ruapehu and a rate of about {{cvt|8|mm}} per year at Taupō. The zone is named after [[Lake Taupō]], the flooded [[caldera]] of the largest volcano in the zone, the [[Taupō Volcano]] and contains a large central [[North Island Volcanic Plateau|volcanic plateau]] as well as other landforms.


==Activity==
==Activity==
[[File:MountNgauruhoe.jpg|thumb|left|[[Mount Ngāuruhoe]]]]
[[File:MountNgauruhoe.jpg|thumb|left|[[Mount Ngauruhoe]]]]
There are numerous volcanic vents and geothermal fields in the zone, with [[Mount Ruapehu]], [[Mount Ngauruhoe]] and [[Whakaari / White Island]] erupting most frequently. Whakaari has been in continuous activity since 1826 if you count such as steaming fumaroles, but the same applies to say the [[:Category:Okataina Volcanic Centre|Okataina volcanic centre]].<ref>{{Cite journal|last1=Waight|first1=Tod E.|last2=Troll|first2=Valentin R.|last3=Gamble|first3=John A.|last4=Price|first4=Richard C.|last5=Chadwick|first5=Jane P.|date=2017-07-01|title=Hf isotope evidence for variable slab input and crustal addition in basalts and andesites of the Taupo Volcanic Zone, New Zealand|url=http://www.sciencedirect.com/science/article/pii/S0024493717301470|journal=Lithos|language=en|volume=284-285|pages=222–236|doi=10.1016/j.lithos.2017.04.009|bibcode=2017Litho.284..222W|issn=0024-4937}}</ref> The Taupō Volcanic Zone has produced in the last 350,000 years over {{convert|3900|km3}} material, more than anywhere else on Earth, from over 300 silicic eruptions, with 12 of these eruptions being caldera-forming.<ref name="Kósik2021">{{cite journal|
There are numerous volcanic vents and geothermal fields in the zone, with [[Mount Ruapehu]], [[Mount Ngauruhoe]] and [[Whakaari / White Island]] erupting most frequently. Whakaari has been in continuous activity since 1826 if you count such as steaming fumaroles, but the same applies to say the [[:Category:Okataina Volcanic Centre|Okataina volcanic centre]].<ref>{{Cite journal|last1=Waight|first1=Tod E.|last2=Troll|first2=Valentin R.|last3=Gamble|first3=John A.|last4=Price|first4=Richard C.|last5=Chadwick|first5=Jane P.|date=2017-07-01|title=Hf isotope evidence for variable slab input and crustal addition in basalts and andesites of the Taupo Volcanic Zone, New Zealand|url=http://www.sciencedirect.com/science/article/pii/S0024493717301470|journal=Lithos|language=en|volume=284–285|pages=222–236|doi=10.1016/j.lithos.2017.04.009|bibcode=2017Litho.284..222W|issn=0024-4937}}</ref> The Taupō Volcanic Zone has produced in the last 350,000 years over {{convert|3900|km3}} material, more than anywhere else on Earth, from over 300 silicic eruptions, with 12 of these eruptions being caldera-forming.<ref name="Kósik2021">{{cite journal|
last1=Kósik|
last1=Kósik|
first1=Szabolcs|
first1=Szabolcs|
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s2cid=233771486|
s2cid=233771486|
url=https://www.researchgate.net/publication/348594991
url=https://www.researchgate.net/publication/348594991
}}</ref> Both the [[Taupō Volcano]] and the [[Ōkataina Caldera]] have had multiple eruptions in the last 25,000 years. The zone's largest eruption since the arrival of Europeans was that of [[Mount Tarawera]] (within the Ōkataina Caldera) in 1886, which killed over 100&nbsp;people. Early [[Māori people|Maori]] would also have been affected by the much larger Kaharoa eruption from Tarawera around 1315 CE.<ref name="Bonadonna 2015">{{cite journal |last1=Bonadonna |first1=C. |last2=Connor |first2=C. B. |last3=Houghton |first3=B. F. |last4=Connor |first4=L. |last5=Byrne |first5=M. |last6=Laing |first6=A. |last7=Hincks |first7=T.K. |title=Probabilistic modeling of tephra dispersal: Hazard assessment of a multiphase rhyolitic eruption at Tarawera, New Zealand |journal=Journal of Geophysical Research: Solid Earth |date=2005-03-15 |volume=110 |issue=B3 |doi=10.1029/2003JB002896 |bibcode=2005JGRB..110.3203B |url=https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2003JB002896}}</ref><ref>{{Cite book |last=David |first=Lowe |chapter=Polynesian settlement and impacts of volcanism on early Maori society |pages=50–55 |editor-last=Lowe |editor-first=D.J. |chapter-url=http://earth.waikato.ac.nz/staff/lowe/download/Rotorua_Land_and_Lakes_field_trip_NZSSS-1_Dec_06-web.pdf |title=Guidebook for 'Land and Lakes' field trip, New Zealand Society of Soil Science Biennial Conference, Rotorua, held in 27–30 November 2006|year=2006 |publisher=New Zealand Society of Soil Science |place=Lincoln }}</ref>
}}</ref> Detailed [[stratigraphy]] in the zone is only available from the Ōkataina Rotoiti eruption but including this event, the zone has been more productive than any other rhyolite predominant volcanic area over the last 50,000 odd years at {{cvt|12.8|km3}} per thousand years.<ref name="Wilson2009">{{cite book |last1=Wilson |first1=C.J.N. |title=Studies in volcanology: the legacy of George Walker |last2=Gravley |first2=D.M. |last3=Leonard |first3=G.S. |last4=Rowland |first4=J.V. |author-link4=Julie Rowland |publisher=IAVCEI Spec Pub 2 |year=2009 |isbn=978-1-86239-280-9 |editor-last1=Thordarson |editor-first1=T. |pages=225–247 |chapter=Volcanism in the central Taupo Volcanic Zone, New Zealand: tempo, styles and controls |doi=10.1144/IAVCEl002.12 |editor-last2=Larsen |editor-first2=G. |editor-last3=Self |editor-first3=S. |editor-last4=Rowland |editor-first4=S. |editor-last5=Hoskuldsson |editor-first5=Á.}}</ref>{{rp|pp=230–232}} Comparison of large events in the Taupō volcanic zone over the last 1.6 million years at {{cvt|3.8|km3}} per thousand years with [[Yellowstone Caldera]]'s 2.1 million year productivity at {{cvt|3.0|km3}} per thousand years favours Taupo.<ref name="Wilson2009" />{{rp|p=225}} Both the [[Taupō Volcano]] and the [[Ōkataina Caldera]] have had multiple eruptions in the last 25,000 years. The zone's largest eruption since the arrival of Europeans was that of [[Mount Tarawera]] (within the Ōkataina Caldera) in 1886, which killed over 100&nbsp;people. Early [[Māori people|Māori]] would also have been affected by the much larger Kaharoa eruption from Tarawera around 1315 CE.<ref name="Bonadonna 2015">{{cite journal |last1=Bonadonna |first1=C. |last2=Connor |first2=C. B. |last3=Houghton |first3=B. F. |last4=Connor |first4=L. |last5=Byrne |first5=M. |last6=Laing |first6=A. |last7=Hincks |first7=T.K. |title=Probabilistic modeling of tephra dispersal: Hazard assessment of a multiphase rhyolitic eruption at Tarawera, New Zealand |journal=Journal of Geophysical Research: Solid Earth |date=2005-03-15 |volume=110 |issue=B3 |doi=10.1029/2003JB002896 |bibcode=2005JGRB..110.3203B |url=https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2003JB002896}}</ref><ref>{{Cite book |last=David |first=Lowe |chapter=Polynesian settlement and impacts of volcanism on early Maori society |pages=50–55 |editor-last=Lowe |editor-first=D.J. |chapter-url=http://earth.waikato.ac.nz/staff/lowe/download/Rotorua_Land_and_Lakes_field_trip_NZSSS-1_Dec_06-web.pdf |title=Guidebook for 'Land and Lakes' field trip, New Zealand Society of Soil Science Biennial Conference, Rotorua, held in 27–30 November 2006|year=2006 |publisher=New Zealand Society of Soil Science |place=Lincoln }}</ref>


The last major eruption from Lake Taupō, the [[Hatepe eruption]], occurred in 232&nbsp;CE.<ref name="Illsley-Kemp 2021">{{cite journal |last1=Illsley-Kemp |first1=Finnigan |last2=Barker |first2=Simon J. |last3=Wilson |first3=Colin J. N. |last4=Chamberlain |first4=Calum J.|last5=Hreinsdóttir |first5=Sigrún|last6=Ellis |first6=Susan|last7=Hamling |first7=Ian J. |last8=Savage |first8=Martha K.|last9=Mestel |first9=Eleanor R. H. |last10=Wadsworth |first10=Fabian B. |title=Volcanic Unrest at Taupō Volcano in 2019: Causes, Mechanisms and Implications|journal=Geochemistry, Geophysics, Geosystems|date=2021-06-01 |volume=22|issue=6 |pages=1–27 |doi=10.1029/2021GC009803|bibcode=2021GGG....2209803I |doi-access=free }}</ref> It is believed to have first emptied the lake, then followed that feat with a [[pyroclastic flow]] that covered about {{convert|20000|km2|abbr=on}} of land with [[volcanic ash]]. A total of {{convert|120|km3|abbr=on}} of material expressed as [[dense-rock equivalent]] (DRE) is believed to have been ejected, and over {{convert|30|km3|abbr=on}} of material is estimated to have been ejected in just a few minutes. The date of this activity was previously thought to be 186 AD as the ash expulsion was thought to be sufficiently large to turn the sky red over [[Rome]] and [[China]] (as documented in [[Hou Han Shu]]), but this has since been disproven.<ref name="Illsley-Kemp 2021" />
The last major eruption from Lake Taupō, the [[Hatepe eruption]], occurred in 232&nbsp;CE.<ref name="Illsley-Kemp 2021">{{cite journal |last1=Illsley-Kemp |first1=Finnigan |last2=Barker |first2=Simon J. |last3=Wilson |first3=Colin J. N. |last4=Chamberlain |first4=Calum J.|last5=Hreinsdóttir |first5=Sigrún|last6=Ellis |first6=Susan|last7=Hamling |first7=Ian J. |last8=Savage |first8=Martha K.|last9=Mestel |first9=Eleanor R. H. |last10=Wadsworth |first10=Fabian B. |title=Volcanic Unrest at Taupō Volcano in 2019: Causes, Mechanisms and Implications|journal=Geochemistry, Geophysics, Geosystems|date=2021-06-01 |volume=22|issue=6 |pages=1–27 |doi=10.1029/2021GC009803|bibcode=2021GGG....2209803I |doi-access=free }}</ref> It is believed to have first emptied the lake, then followed that feat with a [[pyroclastic flow]] that covered about {{convert|20000|km2|abbr=on}} of land with [[volcanic ash]]. A total of {{convert|120|km3|abbr=on}} of material expressed as [[dense-rock equivalent]] (DRE) is believed to have been ejected, and over {{convert|30|km3|abbr=on}} of material is estimated to have been ejected in just a few minutes. The date of this activity was previously thought to be 186 AD as the ash expulsion was thought to be sufficiently large to turn the sky red over [[Rome]] and [[China]] (as documented in [[Hou Han Shu]]), but this has since been disproven.<ref name="Illsley-Kemp 2021" />
[[File:White Island cropped.jpg|thumb|left|[[Whakaari / White Island]]]]


[[Whakaari / White Island]] had a major, edifice failure collapse of its volcano dated to 946&nbsp;BCE ± 52 years. It has been suggested that this was the cause of the tsunami tens of metres tall that went up to {{convert|7|km}} inland in the Bay of Plenty at about this time. Although significant tsunami's can be associated with volcanic eruptions, it is unknown if the cause was a relatively small eruption of Whakaari or another cause such as a large local earthquake<ref name="de Lange 2016">{{cite book |last1=de Lange |first1=Willem |last2=Moon |first2=Vicki |title=Volcanic generation of tsunamis: Two New Zealand palaeo-events in Submarine Mass Movements and their Consequences |year=2016 |at=56 |url=https://researchcommons.waikato.ac.nz/bitstream/handle/10289/11788/deLange+Moon-V5%20(2).pdf?sequence=42}}</ref>
[[Whakaari / White Island]] had a major, edifice failure collapse of its volcano dated to 946&nbsp;BCE ± 52 years. It has been suggested that this was the cause of the tsunami tens of metres tall that went up to {{convert|7|km}} inland in the Bay of Plenty at about this time. Although significant tsunami's can be associated with volcanic eruptions, it is unknown if the cause was a relatively small eruption of Whakaari or another cause such as a large local earthquake<ref name="de Lange 2016">{{cite book |last1=de Lange |first1=Willem |last2=Moon |first2=Vicki |title=Volcanic generation of tsunamis: Two New Zealand palaeo-events in Submarine Mass Movements and their Consequences |year=2016 |at=56 |url=https://researchcommons.waikato.ac.nz/bitstream/handle/10289/11788/deLange+Moon-V5%20(2).pdf?sequence=42}}</ref>


Taupō erupted an estimated {{convert|1170|km3|abbr=on}} of DRE material in its [[Oruanui eruption]] 25,600&nbsp;years ago.<ref name="Dunbar 2017">{{cite journal |last1=Dunbar |first1=Nelia W. |last2=Iverson |first2=Nels A. |last3=Van Eaton |first3=Alexa R. |last4=Sigl |first4=Michael |last5=Alloway |first5=Brent V. |last6=Kurbatov |first6=Andrei V. |last7=Mastin |first7=Larry G. |last8=McConnell |first8=Joseph R. |last9=Wilson |first9=Colin J. N. |title=New Zealand supereruption provides time marker for the Last Glacial Maximum in Antarctica |journal=Scientific Reports |date=2017-09-25 |volume=7 |issue=1 |page=12238 |doi=10.1038/s41598-017-11758-0 |pmid=28947829 |pmc=5613013 |bibcode=2017NatSR...712238D }}</ref> This was Earth's most recent eruption reaching VEI-8, the highest level on the [[Volcanic Explosivity Index]].
Taupō erupted an estimated {{convert|1170|km3|abbr=on}} of DRE material in its [[Oruanui eruption]] 25,580&nbsp;years ago.<ref name="Dunbar 2017">{{cite journal |last1=Dunbar |first1=Nelia W. |last2=Iverson |first2=Nels A. |last3=Van Eaton |first3=Alexa R. |last4=Sigl |first4=Michael |last5=Alloway |first5=Brent V. |last6=Kurbatov |first6=Andrei V. |last7=Mastin |first7=Larry G. |last8=McConnell |first8=Joseph R. |last9=Wilson |first9=Colin J. N. |title=New Zealand supereruption provides time marker for the Last Glacial Maximum in Antarctica |journal=Scientific Reports |date=2017-09-25 |volume=7 |issue=1 |page=12238 |doi=10.1038/s41598-017-11758-0 |pmid=28947829 |pmc=5613013 |bibcode=2017NatSR...712238D }}</ref> This was Earth's most recent eruption reaching VEI-8, the highest level on the [[Volcanic Explosivity Index]].

The [[Rotorua caldera]] has been dormant longer, with its main eruption occurring about 225,000&nbsp;years ago, although [[lava dome]] extrusion has occurred within the last 25,000 years.<ref name="Milner2001">{{cite thesis|last1=Milner |first1=David M |title=The structure and eruptive history of Rotorua Caldera, Taupo Volcanic Zone, New Zealand |url=https://ir.canterbury.ac.nz/handle/10092/12722 |year=2001}}</ref><ref name="gvp">{{cite gvp | vn =241816 | title =Rotorua | access-date = 2010-08-31 }}</ref>


The [[Rotorua caldera]] has been dormant longer, with its main eruption occurring about 225,000&nbsp;years ago, although [[lava dome]] extrusion has occurred within the last 25,000 years.<ref name="Milner2001">{{cite thesis|last1=Milner |first1=David M |title=The structure and eruptive history of Rotorua Caldera, Taupo Volcanic Zone, New Zealand |url=https://ir.canterbury.ac.nz/handle/10092/12722 |year=2001}}</ref><ref name="gvp">{{cite gvp | vn =241816 | title =Rotorua | accessdate = 2010-08-31 }}</ref>
==Extent and geological context==
==Extent and geological context==
[[File:White Island cropped.jpg|thumb|left|[[Whakaari / White Island]]]]
[[File:Lady Knox Geyser.jpg|thumb|left|[[Lady Knox Geyser]], [[Waiotapu]] geothermal area]]
[[File:Lady Knox Geyser.jpg|thumb|left|[[Lady Knox Geyser]], [[Waiotapu]] geothermal area]]
The Taupō volcanic zone is approximately {{convert|350|km|0}} long by {{convert|50|km|0}} wide. Mount Ruapehu marks its southwestern end, while Whakaari / White Island is considered its northeastern limit.<ref>{{Cite journal |doi=10.1080/00288306.1993.9514588 |last1=Gamble |first1=J. A. |first2=I. C. |last2=Wright |first3=J. A. |last3=Baker |year=1993 |url=http://www.rsnz.org/publish/nzjgg/1993/40.php |title=Seafloor geology and petrology in the oceanic to continental transition zone of the Kermadec-Havre-Taupo Volcanic Zone arc system, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=36 |pages=417–435 |issue=4 |url-status=dead |archiveurl=https://web.archive.org/web/20081122075312/http://www.rsnz.org/publish/nzjgg/1993/40.php |archivedate=2008-11-22 }}</ref>
The Taupō volcanic zone is approximately {{convert|350|km|0}} long by {{convert|50|km|0}} wide. Mount Ruapehu marks its southwestern end, while Whakaari / White Island is considered its northeastern limit.<ref>{{Cite journal |doi=10.1080/00288306.1993.9514588 |last1=Gamble |first1=J. A. |first2=I. C. |last2=Wright |first3=J. A. |last3=Baker |year=1993 |url=http://www.rsnz.org/publish/nzjgg/1993/40.php |title=Seafloor geology and petrology in the oceanic to continental transition zone of the Kermadec-Havre-Taupo Volcanic Zone arc system, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=36 |pages=417–435 |issue=4 |url-status=dead |archive-url=https://web.archive.org/web/20081122075312/http://www.rsnz.org/publish/nzjgg/1993/40.php |archive-date=2008-11-22 }}</ref>


It forms a southern portion of the active [[Lau Basin|Lau-Havre-Taupō]] [[back-arc basin]], which lies behind the [[Kermadec-Tonga Subduction Zone]].<ref>{{Cite journal |year=2019 |title=Early evolution of a young back-arc basin in the Havre Trough |journal=Nature Geoscience |volume=12 |pages=856–862 |doi=10.1038/s41561-019-0439-y |first1=F. |last1=Caratori Tontini |first2=D. |last2=Bassett |first3=C. E. J. |last3=de Ronde |first4=C. |last4=Timm |first5=R. |last5=Wysoczanski|s2cid=202580942 |issue=10 |bibcode=2019NatGe..12..856C |url=http://oceanrep.geomar.de/47797/13/pm_2019_44_plattenbewegung-NZ.pdf }}</ref><ref>{{Cite journal |year=1996 |title=The Lau-Havre-Taupo back-arc basin: A southward-propagating, multi-stage evolution from rifting to spreading |journal=Tectonophysics |volume=263 |issue=1–4 |pages=1–22 |doi=10.1016/S0040-1951(96)00029-7 |first1=L. M. |last1=Parson |first2=I. C. |last2=Wright |bibcode=1996Tectp.263....1P}}</ref> Mayor Island and Mount Taranaki are recently active back arc volcanoes on the New Zealand extension of this arc. [[Mayor Island / Tūhua]] is the northern-most shield volcano adjacent to the New Zealand coast, and is believed to have been active in the last 1000 years. <ref name="Houghton1995">{{Cite journal |last1 = Houghton|first1 = B.F. |last2=Wilson |first2= J. N. C|last3=Weaver|first3=S.D.|last4=Lanphere |first4= M.A.|last5= Barclay |first5=J|year= 1995|title = Mayor Island Geology|journal = Volcanic Hazards at Mayor Island. [Palmerston North, NZ]: Ministry of Civil Defence. Volcanic Hazards Information Series 6. |pages = 1–23 |url= https://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Volcano-Geology-and-Hazards/Mayor-Island-Geology}}</ref> It is formed from [[rhyolite]] magma.<ref>{{Cite journal |last1 = Houghton| first1 = Bruce F. |last2=Weaver |first2=S.D. |last3=Wilson |first3= J. N.|last4=Lanphere |first4= M.A.|url= https://www.sciencedirect.com/science/article/abs/pii/037702739290124V|title = Evolution of a quaternary peralkaline volcano: Mayor Island, New Zealand.| journal = Journal of Volcanology and Geothermal Research| volume= 51 | issue = 3 |pages = 217–236 |year = 1992|doi = 10.1016/0377-0273(92)90124-V| bibcode = 1992JVGR...51..217H }}</ref> It has a quite complex eruptive history but only with one definite significant [[Plinian eruption]].<ref name="Houghton1995"/> [[Mount Taranaki]] is an [[andesite]] cone and the most recent of four Taranaki volcanoes about {{convert|140|km|abbr=on}} west of the Taupō Volcanic Zone.<ref>{{Cite journal |last1 = Price|first1=R. C. |last2=Stewart |first2=R. B. |last3=Woodhead|first3=J. D.|last4= Smith |first4= I. E. M. |title = Petrogenesis of High-K Arc Magmas: Evidence from Egmont Volcano, North Island, New Zealand|journal= Journal of Petrology|volume = 40|issue = 1|year = 1999|pages=167–197 |url=https://academic.oup.com/petrology/article/40/1/167/1572845 |doi = 10.1093/petroj/40.1.167|doi-access= free}}</ref>
It forms a southern portion of the active [[Lau Basin|Lau-Havre-Taupō]] [[back-arc basin]], which lies behind the [[Kermadec-Tonga Subduction Zone]].<ref>{{Cite journal |year=2019 |title=Early evolution of a young back-arc basin in the Havre Trough |journal=Nature Geoscience |volume=12 |pages=856–862 |doi=10.1038/s41561-019-0439-y |first1=F. |last1=Caratori Tontini |first2=D. |last2=Bassett |first3=C. E. J. |last3=de Ronde |first4=C. |last4=Timm |first5=R. |last5=Wysoczanski|s2cid=202580942 |issue=10 |bibcode=2019NatGe..12..856C |url=http://oceanrep.geomar.de/47797/13/pm_2019_44_plattenbewegung-NZ.pdf }}</ref><ref>{{Cite journal |year=1996 |title=The Lau-Havre-Taupo back-arc basin: A southward-propagating, multi-stage evolution from rifting to spreading |journal=Tectonophysics |volume=263 |issue=1–4 |pages=1–22 |doi=10.1016/S0040-1951(96)00029-7 |first1=L. M. |last1=Parson |first2=I. C. |last2=Wright |bibcode=1996Tectp.263....1P}}</ref> Mayor Island and Mount Taranaki are recently active back arc volcanoes on the New Zealand extension of this arc. [[Mayor Island / Tūhua]] is the northern-most shield volcano adjacent to the New Zealand coast, and is believed to have been active in the last 1000 years.<ref name="Houghton1995">{{Cite journal |last1 = Houghton|first1 = B.F. |last2=Wilson |first2= J. N. C|last3=Weaver|first3=S.D.|last4=Lanphere |first4= M.A.|last5= Barclay |first5=J|year= 1995|title = Mayor Island Geology|journal = Volcanic Hazards at Mayor Island. [Palmerston North, NZ]: Ministry of Civil Defence. Volcanic Hazards Information Series 6. |pages = 1–23 |url= https://www.gns.cri.nz/Home/Learning/Science-Topics/Volcanoes/New-Zealand-Volcanoes/Volcano-Geology-and-Hazards/Mayor-Island-Geology}}</ref> It is formed from [[rhyolite]] magma.<ref>{{Cite journal |last1 = Houghton| first1 = Bruce F. |last2=Weaver |first2=S.D. |last3=Wilson |first3= J. N.|last4=Lanphere |first4= M.A.|url= https://www.sciencedirect.com/science/article/abs/pii/037702739290124V|title = Evolution of a quaternary peralkaline volcano: Mayor Island, New Zealand.| journal = Journal of Volcanology and Geothermal Research| volume= 51 | issue = 3 |pages = 217–236 |year = 1992|doi = 10.1016/0377-0273(92)90124-V| bibcode = 1992JVGR...51..217H }}</ref> It has a quite complex eruptive history but only with one definite significant [[Plinian eruption]].<ref name="Houghton1995"/> [[Mount Taranaki]] is an [[andesite]] cone and the most recent of four Taranaki volcanoes about {{convert|140|km|abbr=on}} west of the Taupō Volcanic Zone.<ref>{{Cite journal |last1 = Price|first1=R. C. |last2=Stewart |first2=R. B. |last3=Woodhead|first3=J. D.|last4= Smith |first4= I. E. M. |title = Petrogenesis of High-K Arc Magmas: Evidence from Egmont Volcano, North Island, New Zealand|journal= Journal of Petrology|volume = 40|issue = 1|year = 1999|pages=167–197 |url=https://academic.oup.com/petrology/article/40/1/167/1572845 |doi = 10.1093/petroj/40.1.167|doi-access= free}}</ref>


Within the Taupō volcanic zone, intra-arc extension is expressed as normal faulting within a zone known as the [[Taupō Rift]].<ref name="Holden2015">{{Cite journal |date=2015-07-28 |last1 =Holden|first1 =Lucas|last2 =Wallace|first2= L.|last3 = Beavan|first3 =J.|last4 =Fournier|first4 =Nico|last5 = Cas|first5 = Raymond|last6= Ailleres|first6 = Laurent|last7 = Silcock|first7 = David.|title =Contemporary ground deformation in the Taupo Rift and Okataina Volcanic Centre from 1998 to 2011, measured using GPS.|journal =Geophysical Journal International|volume = 202|issue =3|pages =2082–2105|url =https://academic.oup.com/gji/article/202/3/2082/609241|doi =10.1093/gji/ggv243|doi-access = free}}</ref> Volcanic activity continues to the north-northeast, along the line of the Taupō Volcanic Zone, through several undersea volcanoes in the [[South Kermadec Ridge Seamounts]], then shifts eastward to the parallel [[volcanic arc]] of the [[Kermadec Islands]] and [[Tonga]]. Although the back-arc basin continues to propagate to the southwest, with the South [[Wanganui Basin]] forming an initial back-arc basin, volcanic activity has not yet begun in this region.<ref>{{Cite journal |doi=10.1080/00288306.2006.9515145 |first1=P. |last1=Villamor |first2=K. R. |last2=Berryman |year=2006 |title=Evolution of the southern termination of the Taupo Rift, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=49 |pages=23–37 |doi-access=free }}</ref>
Associated with the Taupō volcanic zone, intra-arc extension is expressed as normal faulting within a zone known as the Taupō Rift.<ref name="Holden2015">{{Cite journal |date=2015-07-28 |last1 =Holden|first1 =Lucas|last2 =Wallace|first2= L.|last3 = Beavan|first3 =J.|last4 =Fournier|first4 =Nico|last5 = Cas|first5 = Raymond|last6= Ailleres|first6 = Laurent|last7 = Silcock|first7 = David.|title =Contemporary ground deformation in the Taupo Rift and Okataina Volcanic Centre from 1998 to 2011, measured using GPS.|journal =Geophysical Journal International|volume = 202|issue =3|pages =2082–2105|url =https://academic.oup.com/gji/article/202/3/2082/609241|doi =10.1093/gji/ggv243|doi-access = free}}</ref> Volcanic activity continues to the north-northeast, along the line of the Taupō Volcanic Zone, through several undersea volcanoes in the [[South Kermadec Ridge Seamounts]], then shifts eastward to the parallel [[volcanic arc]] of the [[Kermadec Islands]] and [[Tonga]]. Although the back-arc basin continues to propagate to the south-west, with the South [[Wanganui Basin]] forming an initial back-arc basin, volcanic activity has not yet begun in this region.<ref>{{Cite journal |doi=10.1080/00288306.2006.9515145 |first1=P. |last1=Villamor |first2=K. R. |last2=Berryman |year=2006 |title=Evolution of the southern termination of the Taupo Rift, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=49 |pages=23–37 |doi-access=free }}</ref>


South of [[Kaikōura]] the plate boundary changes to a [[transform boundary]] with oblique [[continental collision]] uplifting the [[Southern Alps / Kā Tiritiri o te Moana]] in the [[South Island]]. A subduction zone reappears southwest of [[Fiordland]], at the southwestern corner of the South Island, although here the subduction is in the opposite direction. [[Solander Island / Hautere]] is an extinct volcano associated with this subduction zone, and the only one that protrudes above the sea.
South of [[Kaikōura]] the plate boundary changes to a [[transform boundary]] with oblique [[continental collision]] uplifting the [[Southern Alps]] in the [[South Island]]. A subduction zone reappears south-west of [[Fiordland]], at the south-western corner of the South Island, although here the subduction is in the opposite direction. [[Solander Island / Hautere]] is an extinct volcano associated with this subduction zone, and the only one that protrudes above the sea.
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==Scientific study==
==Scientific study==
===Tectonics===
===Tectonics===
{{main|Taupō Rift}}
{{main|Taupō Rift}}
Recent scientific work indicates that the Earth's crust below the Taupō Volcanic Zone may be as little as 16&nbsp;kilometres thick. A film of [[magma]] 50&nbsp;kilometres (30&nbsp;mi) wide and 160&nbsp;kilometres (100&nbsp;mi) long lies 10&nbsp;kilometres under the surface.<ref>{{cite web |url=http://www.stuff.co.nz/4202557a11.html |title=Central North Island sitting on magma film |first=Paul |last=Easton |publisher=The Dominion Post |date=15 September 2007 |accessdate=16 March 2008 }}</ref><ref>{{Cite journal |first1=W. |last1=Heise |first2=H.M. |last2=Bibby |first3=T.G. |last3=Caldwell |year=2007 |url=http://www.cosis.net/abstracts/EGU2007/01311/EGU2007-J-01311.pdf?PHPSESSID=e |title=Imaging magmatic Processes in the Taupo Volcanic Zone (New Zealand) with Magnetotellurics |journal=Geophysical Research Abstracts |volume=9}} 01311.</ref> The geological record indicates that some of the volcanoes in the area erupt infrequently but have large, violent and destructive eruptions when they do.


In the North Island rifting associated with plate tectonics has defined a Central Volcanic Region, that has been active for four million years and this extends westward from the Taupō volcanic zone through the western Bay of Plenty to the eastern side of the [[Coromandel Peninsula]].<ref name=Cole1995>{{cite book |last1=Cole |first1=J.W. |last2=Darby |first2=D.J. |last3=Stern |first3=T.A. |year=1995 |chapter=Taupo Volcanic Zone and Central Volcanic Region: Backarc Structures of North Island, New Zealand |editor-last=Taylor |editor-first=Brian |title=Backarc Basins: Tectonics and Magmatism |location=New York |publisher=Plenum |page=3 |isbn=978-1-4615-1843-3}}</ref> The dominant rifting axis associated with the Central Volcanic Region has moved with time, from the back-arc associated [[Hauraki Rift]] to the intra-arc Taupō Rift. As there is presently no absolute consensus with regard to the cause of the Taupō Rift's extension or its exceptional current volcanic productivity, some of the discussion on this page has been simplified, rather than all possible models being presented.
Technically the zone is in the continental intraarc Taupō Rift. This has had three active stages of faulting in the last 2 million years with the modern Taupō rift evolving in the last 25,000 years after the massive [[Oruanui eruption]] being within two essentially inactive rift systems. These are the surrounding limits of the young Taupō Rift between 25,000 and 350,000 years and old Taupō Rift system whose northern boundary is now located well to the north of the other two being created between 350,000 and 2 million years.<ref name="Rifting" />

Recent scientific work indicates that the Earth's crust below the Taupō Volcanic Zone may be as little as 16&nbsp;kilometres thick. A film of [[magma]] 50&nbsp;kilometres (30&nbsp;mi) wide and 160&nbsp;kilometres (100&nbsp;mi) long lies 10&nbsp;kilometres under the surface.<ref>{{cite web |url=http://www.stuff.co.nz/4202557a11.html |title=Central North Island sitting on magma film |first=Paul |last=Easton |publisher=The Dominion Post |date=15 September 2007 |access-date=16 March 2008 }}</ref><ref>{{Cite journal |first1=W. |last1=Heise |first2=H.M. |last2=Bibby |first3=T.G. |last3=Caldwell |year=2007 |url=http://www.cosis.net/abstracts/EGU2007/01311/EGU2007-J-01311.pdf?PHPSESSID=e |title=Imaging magmatic Processes in the Taupo Volcanic Zone (New Zealand) with Magnetotellurics |journal=Geophysical Research Abstracts |volume=9}} 01311.</ref> The geological record indicates that some of the volcanoes in the area erupt infrequently but have large, violent and destructive eruptions when they do. Technically the zone is in the continental intraarc Taupō Rift, which is a continuation of oceanic plate structures associated with oblique [[Australian Plate|Australian]] and [[Pacific Plate]] convergence in the [[Hikurangi subduction zone]]. At Taupō the rift volcanic zone is widening east–west at the rate of about {{cvt|8|mm}}/year, while at Mount Ruapehu it is only {{cvt|2|–|4|mm}}/year and this increases at the north eastern end at the Bay of Plenty coast to {{cvt|10|–|15|mm}}/year.<ref name="Rifting">{{Cite journal |last1=Villimor |first1=P. |last2=Berryman |first2=K. R. |last3=Ellis |first3=S. M. |author-link3=Susan Ellis (geophysicist) |last4=Schreurs |first4=G. |last5=Wallace |first5=L. M. |last6=Leonard |first6=G. S. |last7=Langridge |first7=R. M. |last8=Ries |first8=W. F. |date=2017-10-04 |title=Rapid Evolution of Subduction-Related Continental Intraarc Rifts: The Taupo Rift, New Zealand |journal=Tectonics |language=en |volume=36 |issue=10 |pages=2250–2272 |bibcode=2017Tecto..36.2250V |doi=10.1002/2017TC004715 |s2cid=56356050|doi-access=free }}</ref> The rift has had three active stages of faulting in the last 2 million years with the modern Taupō rift evolving in the last 25,000 years after the massive [[Oruanui eruption]] and now being within two essentially inactive rift systems. These are the surrounding limits of the young Taupō Rift between 25,000 and 350,000 years and old Taupō Rift system whose northern boundary is now located well to the north of the other two being created before 350,000 years ago.<ref name="Rifting" />

The [[Tauranga Volcanic Centre]] which was active between 2.95 to 1.9 million years ago, and was previously classified as part of the Central Volcanic Region,<ref name=Cole1995/> appears now to be in a tectonic continuum with the Taupō Volcanic Zone. Recent ocean floor tephra studies off the east coast of the North Island have shown an abrupt compositional change in these, from about 4.5 million years ago, that has been suggested to distinguish [[Coromandel Volcanic Zone]] activity from that of the Taupō Volcanic Zone.<ref name=Pank2023>{{cite journal| last1=Pank| first1=K|last2= Kutterolf| first2=S| last3=Hopkins| first3=JL| last4=Wang| first4=KL| last5=Lee| first5=HY| last6=Schmitt| first6=AK| title=Advances in New Zealand's tephrochronostratigraphy using marine drill sites: The Neogene| journal=Geochemistry, Geophysics, Geosystems| year=2023| volume=24| issue=8| at=e2023GC010866 |doi=10.1029/2023GC010866| doi-access=free}}</ref> Further the distinctive Waiteariki ignimbrite that erupted 2.1 million years ago in a supereruption, presumably from the gravity anomaly defined [[Omanawa Caldera]],<ref name=Stagpoole2021>{{cite journal|last1=Stagpoole |first1=V|last2= Miller |first2=C|last3= Caratori |first3=Tontini F|last4= Brakenrig |first4=T |last5=Macdonald |first5=N |year=2021 |title= A two million-year history of rifting and caldera volcanism imprinted in new gravity anomaly compilation of the Taupō Volcanic Zone, New Zealand |journal=New Zealand Journal of Geology and Geophysics| volume= 64| issue= 2–3| pages=358–371 | doi=10.1080/00288306.2020.1848882 |s2cid=230527523| url=https://www.tandfonline.com/doi/full/10.1080/00288306.2020.1848882 }}</ref> is within the postulated borders of the old Taupō Rift.<ref name=Prentice2022>{{cite journal|first1=Marlena |last1=Prentice |first2= Adrian |last2=Pittari |first3= David J. |last3=Lowe |first4= Geoff |last4=Kilgour |first5= Peter J.J. |last5=Kamp |first6= Miriam | last6=Namaliu |title=Linking proximal ignimbrites and coeval distal tephra deposits to establish a record of voluminous Early Quaternary (2.4–1.9 Ma) volcanism of the Tauranga Volcanic Centre, New Zealand |journal=Journal of Volcanology and Geothermal Research |volume =429 |year=2022 |issue=107595 |page=107595 |issn=0377-0273 |doi=10.1016/j.jvolgeores.2022.107595 |s2cid=249264293 |url=https://www.sciencedirect.com/science/article/pii/S0377027322001263 }}</ref>

====Faults====
====Faults====
The multiple intra-rift [[Fault (geology)|fault]]s are some of the most active in the country and some have the potential to create over magnitude 7 events. The fault structures are perhaps most well characterised related to the Ruapehu and Tongariro [[graben]]s. The recent deposits from major eruptions and lake features mean many potentially significant faults are uncharacterised, either completely (for example the 6.5 Mw [[1987 Edgecumbe earthquake]] resulted in the mapping of the Edgecumbe fault for the first time) or frequency of events and their likely magnitude are not understood. It can not be assumed that just because the rate of expansion of the rift is greatest near the coast that this is where most significant tectonic earthquakes in terms of human risk will be. The [[Waihi Fault Zone]] south of Lake Taupō and associated with the Tongariro graben has a particular risk of inducing massive landslips which has caused significant loss of life and appears to be more active than many other faults in the zone.
The multiple intra-rift [[Fault (geology)|fault]]s are some of the most active in the country and some have the potential to create over magnitude 7 events. The fault structures are perhaps most well characterised related to the Ruapehu and Tongariro [[graben]]s. The recent deposits from major eruptions and lake features mean many potentially significant faults are uncharacterised, either completely (for example the 6.5 MW [[1987 Edgecumbe earthquake]] resulted in the mapping of the Edgecumbe fault for the first time) or frequency of events and their likely magnitude are not understood. It can not be assumed that just because the rate of expansion of the rift is greatest near the coast that this is where most significant tectonic earthquakes in terms of human risk will be. The [[Waihi Fault Zone]] south of Lake Taupō and associated with the Tongariro graben has a particular risk of inducing massive landslips which has caused significant loss of life and appears to be more active than many other faults in the zone.


===Volcanism===
===Volcanism===
[[File:Inside the Tarawera rift.jpg|thumb|left|In 1886, Mount Tarawera produced New Zealand's largest historic eruption since European colonisation]]
[[File:Inside the Tarawera rift.jpg|thumb|left|In 1886, Mount Tarawera produced New Zealand's largest historic eruption since European colonisation]]
The north (Whakatane Graben – Bay of Plenty) part of the zone is predominantly formed from [[andesitic]] [[magma]]<ref name="Cole2009">{{Cite journal |last1=Cole |first1=J. W. |last2=Spinks |first2=K. D. |s2cid=131562598 |year=2009 |title=Caldera volcanism and rift structure in the Taupo Volcanic Zone, New Zealand |publisher=Geological Society |place=London |journal=Special Publications |volume=327 |pages=9–29 |doi=10.1144/SP327.2 |url=http://sp.lyellcollection.org/cgi/content/abstract/327/1/9 |issue=1|bibcode = 2009GSLSP.327....9C }}</ref><ref>{{cite book |last1=Hiess |first1=J |last2=Cole |first2=JW |last3=Spinks |first3=KD |year=2007 |title=High-Alumina Basalts of the Taupo Volcanic Zone, New Zealand: Influence of the Crust and Crustal Structure |page=36 |url=http://ir.canterbury.ac.nz/bitstream/10092/3172/1/12605971_Hiess%20%202007%20final.pdf |via=Part of a BSc Project by Hiess, J. (University of Canterbury).}}</ref> and represented by the continuously active Whakaari / White Island [[andesite]]–[[dacite]] stratovolcano. Although [[Strombolian eruption|Strombolian]] activity has occurred the [[explosive eruption]]s are typically [[Phreatic eruption|phreatic]] or [[Phreatomagmatic eruption|phreatomagmatic]].<ref>{{Cite journal|title=The 1976–1982 Strombolian and phreatomagmatic eruptions of White Island, New Zealand: eruptive and depositional mechanisms at a 'wet' volcano|journal=Bulletin of Volcanology|volume=54|issue=1|pages=25–49|date=1 December 1991|doi=10.1007/BF00278204|last1=Houghton|first1=B. F.|last2=Nairn|first2=I. A.|bibcode=1991BVol...54...25H|s2cid=128897275}}</ref> The active emergent summit tops the larger, {{convert|16|km}} × {{convert|18|km}}, submarine volcano with a total volume of {{convert|78|km3|cumi|abbr=on}}.<ref name="ColeOthers2000a">Cole, J.W., Thordarson, T. and Burt, R.M., 2000. ''Magma origin and evolution of White Island (Whakaari) volcano, Bay of plenty, New Zealand''. ''Journal of Petrology'', 41(6), pp.867–895.</ref><ref name="MoonOthers2009a">Moon, V., Bradshaw, J. and de Lange, W., 2009. ''Geomorphic development of White Island Volcano based on slope stability modelling.'' ''Engineering Geology'', 104(1–2), pp.16–30.</ref><ref name="Jimenez2015">Jimenez, C., 2015. ''Magmatic-hydrothermal system at White Island volcano, North Island, New Zealand''. in M. Calder, ed., pp. 35–46, ''JCU SEG Student Chapter New Zealand, North Island Field Trip 2015 Guide Book.'' Queensland, Australia: James Cook University SEG Student Chapter, Society of Economic Geologists, Inc.</ref><ref name="Duncan1970a">{{cite thesis|last1=Duncan |first1=A.R. |year= 1970 |title=The petrology and petrochemistry of andesite volcanoes in Eastern Bay of Plenty, New Zealand |publisher= Victoria University of Wellington, New Zealand |at=362 |url=https://openaccess.wgtn.ac.nz/articles/thesis/The_Petrology_and_Petrochemistry_of_Andesite_and_Dacite_Volcanoes_in_Eastern_Bay_of_Plenty_New_Zealand/16949062/1/files/31360624.pdf}}</ref>
The north ([[Whakatane Graben]] – Bay of Plenty) part of the zone is predominantly formed from [[andesitic]] [[magma]]<ref name="Cole2009">{{Cite journal |last1=Cole |first1=J. W. |last2=Spinks |first2=K. D. |s2cid=131562598 |year=2009 |title=Caldera volcanism and rift structure in the Taupo Volcanic Zone, New Zealand |publisher=Geological Society |place=London |journal=Special Publications |volume=327 |pages=9–29 |doi=10.1144/SP327.2 |url=http://sp.lyellcollection.org/cgi/content/abstract/327/1/9 |issue=1|bibcode = 2009GSLSP.327....9C }}</ref><ref>{{cite book |last1=Hiess |first1=J |last2=Cole |first2=JW |last3=Spinks |first3=KD |year=2007 |title=High-Alumina Basalts of the Taupo Volcanic Zone, New Zealand: Influence of the Crust and Crustal Structure |page=36 |url=http://ir.canterbury.ac.nz/bitstream/10092/3172/1/12605971_Hiess%20%202007%20final.pdf |via=Part of a BSc Project by Hiess, J. (University of Canterbury).}}</ref> and represented by the continuously active Whakaari / White Island [[andesite]]–[[dacite]] stratovolcano. Although [[Strombolian eruption|Strombolian]] activity has occurred the [[explosive eruption]]s are typically [[Phreatic eruption|phreatic]] or [[Phreatomagmatic eruption|phreatomagmatic]].<ref>{{Cite journal|title=The 1976–1982 Strombolian and phreatomagmatic eruptions of White Island, New Zealand: eruptive and depositional mechanisms at a 'wet' volcano|journal=Bulletin of Volcanology|volume=54|issue=1|pages=25–49|date=1 December 1991|doi=10.1007/BF00278204|last1=Houghton|first1=B. F.|last2=Nairn|first2=I. A.|bibcode=1991BVol...54...25H|s2cid=128897275}}</ref> The active emergent summit tops the larger, {{convert|16|km}} × {{convert|18|km}}, submarine volcano with a total volume of {{convert|78|km3|cumi|abbr=on}}.<ref name="ColeOthers2000a">Cole, J.W., Thordarson, T. and Burt, R.M., 2000. ''Magma origin and evolution of White Island (Whakaari) volcano, Bay of plenty, New Zealand''. ''Journal of Petrology'', 41(6), pp.867–895.</ref><ref name="MoonOthers2009a">Moon, V., Bradshaw, J. and de Lange, W., 2009. ''Geomorphic development of White Island Volcano based on slope stability modelling.'' ''Engineering Geology'', 104(1–2), pp.16–30.</ref><ref name="Jimenez2015">Jimenez, C., 2015. ''Magmatic-hydrothermal system at White Island volcano, North Island, New Zealand''. in M. Calder, ed., pp. 35–46, ''JCU SEG Student Chapter New Zealand, North Island Field Trip 2015 Guide Book.'' Queensland, Australia: James Cook University SEG Student Chapter, Society of Economic Geologists, Inc.</ref><ref name="Duncan1970a">{{cite thesis|last1=Duncan |first1=A.R. |year= 1970 |title=The petrology and petrochemistry of andesite volcanoes in Eastern Bay of Plenty, New Zealand |publisher= Victoria University of Wellington, New Zealand |at=362 |url=https://openaccess.wgtn.ac.nz/articles/thesis/The_Petrology_and_Petrochemistry_of_Andesite_and_Dacite_Volcanoes_in_Eastern_Bay_of_Plenty_New_Zealand/16949062/1/files/31360624.pdf}}</ref>

The central part of the zone is composed of eight caldera centres the oldest of which is the Mangakino caldera which was active more than a million years ago (1.62–0.91 Ma).<ref name="Cole2009"/> This produced ignimbrite that {{convert|170|km|abbr=on}} away in Auckland is up to {{convert|9|m|abbr=on}} thick.<ref name="NZSSS2006">{{cite web |url=https://sciencedocbox.com/Geology/79493941-Land-and-lakes-guidebook-for-land-and-lakes-field-trip-tuesday-28-th-november-2006.html|title = GUIDEBOOK FOR LAND AND LAKES FIELD TRIP |date=2006-11-28 |publisher=New Zealand Society of Soil Science }}</ref> Other than the now buried Kapenga caldera there are five caldera centres, Rotorua, Ohakuri, Reporoa, Ōkataina and Taupō. These have resulted from massive infrequent eruptions of gaseous very viscous [[rhyolite]] magma which is rich in [[silicon]], [[potassium]], and [[sodium]] and created the ignimbrite sheets of the [[North Island Volcanic Plateau]]. The detailed composition suggests [[subduction erosion]] might play a predominant role in producing this rhyolite,<ref>{{cite thesis|last1=Santa Cruz| first1=Carlos Rodolfo Corella |title= Subduction cycling and its controls on hyperactive volcanism in the Taupo Volcanic Zone, New Zealand: a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Earth Science| publisher= Massey University, Palmerston North, New Zealand| year=2023 |url=https://mro.massey.ac.nz/handle/10179/20052}}</ref>{{rp|loc=abstract}} as later assimilation and fractional crystallization of primary basalt magma, is difficult to model to explain the composition and volumes erupted.<ref name=SantaCruz2023>{{cite journal| last1=Santa Cruz|first1= CRC| last2=Zellmer| first2=GF| last3=Stirling| first3=CH| last4=Straub| first4=SM| last5=Brenna| first5=M| last6=Reid| first6=MR| last7=Németh| first7=K| last8=Barr| first8=D| title=Transcrustal and source processes affecting the chemical characteristics of magmas in a hyperactive volcanic zone| journal=Geochimica et Cosmochimica Acta| date=1 July 2023| volume=352| pages=86–106 | doi=10.1016/j.gca.2023.05.003 }}</ref> This central zone has had the largest number of very large silicic caldera-forming eruptions recently on earth as mentioned earlier.<ref name="Gualda2018">{{Cite journal|title=Climbing the crustal ladder: Magma storage-depth evolution during a volcanic flare-up |first1=Guilherme A. R. |last1=Gualda |first2= Darren M. |last2=Gravley |first3= Michelle |last3=Connor| first4= Brooke |last4=Hollmann |first5= Ayla S. |last5=Pamukcu |first6= Florence |last6=Bégué |first7= Mark S. |last7=Ghiorso |first8=Chad D. |last8=Deering|journal=Science Advances |volume=4 |issue=10 |pages=eaap7567 |year=2018|doi= 10.1126/sciadv.aap7567 |pmid=30324132 |pmc=6179376 |doi-access=free }}</ref><ref name="Wilson2009" />

During a period of less than 100,000 years commencing with the massive [[Whakamaru Caldera|Whakamaru eruption]] about 335,000 years ago of greater than {{convert|2000|km3|abbr=on}} [[dense-rock equivalent]] of material, just to the north of the present [[Lake Taupō]], over {{convert|4000|km3|abbr=on}} total was erupted. These eruptions essentially defined the limits of the present [[North Island Volcanic Plateau|central volcanic plateau]], although its current central landscape is mainly a product of later smaller events over the last 200,000 years than the Whakamaru eruption. The other volcanic plateau defining eruptions were to the west, the {{convert|150|km3|abbr=on}} [[Ōkataina Caldera|Matahina eruption]] of about 280,000 years ago, the mainly tephra {{convert|50|km3|abbr=on}} Chimp (Chimpanzee) eruption between 320 and 275 ka, the central {{convert|50|km3|abbr=on}} [[Kapenga Caldera|Pokai eruption]] of about 275 ka, and the paired [[Rotorua Caldera|Mamaku]] to the north and east central [[Ohakuri Caldera|Ohakuri]] eruptions of about 240,000 years ago that together produced more than {{convert|245|km3|abbr=on}} dense-rock equivalent of material.<ref name="Gualda2018"/> The southern [[Taupō Volcano]] [[Oruanui eruption]] about 25,600 years ago produced {{convert|530|km3|abbr=on}} dense-rock equivalent of material and its recent [[Hatepe eruption]] of 232 CE ± 10 years had {{convert|120|km3|abbr=on}} dense-rock equivalent.<ref name="Illsley-Kemp 2021"/> Since the Whakamaru eruption the central part of the zone has dominated, so that when the whole zone is considered there has been about {{cvt|3000|km3}} of rhyolite, {{cvt|300|km3}} of andesite, {{cvt|20|km3}} of dacite and {{cvt|5|km3}} of basalt erupted.<ref name="Wilson2009" />{{rp|pp=228,231}}


Less gaseous [[rhyolite]] magma dome building effusive eruptions have built features such as the [[Horomatangi Reef]]s or [[Motutaiko Island]] in [[Lake Taupō]] or the lava dome of [[Mount Tarawera]]. This later as part of the Ōkataina caldera complex is the highest risk volcanic field in New Zealand to man.<ref name="Doherty2009">{{Cite web|last1=Doherty|first1=Angela Louise |url=https://core.ac.uk/download/pdf/35460853.pdf| title=Blue-sky eruptions, do they exist? Implications for monitoring New Zealand's volcanoes. |year=2009 |publisher=University of Canterbury|access-date=2022-06-07 }}</ref> [[Mount Tauhara]] adjacent to Lake Taupō is actually a [[dacitic]] dome <ref>[http://www.gns.cri.nz/what/earthact/volcanoes/nzvolcanoes/taupoprint.htm Volcanic Hazards Working Group of the Civil Defence Scientific Advisory Committee, which includes scientists from the Institute of Geological and Nuclear Sciences and the Universities, Number seven "Taupo Volcanic Centre"] {{webarchive|url=https://web.archive.org/web/20061006170713/http://www.gns.cri.nz/what/earthact/volcanoes/nzvolcanoes/taupoprint.htm |date=2006-10-06 }}</ref> and so intermediate in composition between [[andesite]] and [[rhyolite]] but still more viscous than [[basalt]] which is rarely found in the zone.<ref name="Bertrand2022">{{cite journal| first1=E.A. |last1=Bertrand |first2= P. |last2=Kannberg |first3= T.G. |last3=Caldwell |first4=W. |last4=Heise |first5= S. |last5=Constable |first6= B. |last6=Scott |first7= S. |last7=Bannister |first8= G. |last8=Kilgour |first9= S.L. |last9=Bennie |first10= R. |last10=Hart |first11= N. |last11=Palmer |title=Inferring the magmatic roots of volcano-geothermal systems in the Rotorua Caldera and Okataina Volcanic Centre from magnetotelluric models |journal=Journal of Volcanology and Geothermal Research |volume=431 |year=2022 |issue=107645 |page=107645 |issn=0377-0273 |doi=10.1016/j.jvolgeores.2022.107645 |s2cid=251526385 |url=https://www.sciencedirect.com/science/article/pii/S0377027322001767 }}</ref>
The central part of the zone is composed of eight caldera centres the oldest of which is the Mangakino caldera which was active more than a million years ago (1.62–0.91 Ma).<ref name="Cole2009"/> This produced ignimbrite that {{convert|170|km|abbr=on}} away in Auckland is up to {{convert|9|m|abbr=on}} thick.<ref name="NZSSS2006">{{cite web |url=https://sciencedocbox.com/Geology/79493941-Land-and-lakes-guidebook-for-land-and-lakes-field-trip-tuesday-28-th-november-2006.html|title = GUIDEBOOK FOR LAND AND LAKES FIELD TRIP |date=2006-11-28 |publisher=New Zealand Society of Soil Science }}</ref> Other than the now buried Kapenga caldera there are five caldera centres, Rotorua, Ohakuri, Reporoa, Ōkataina and Taupō. These have resulted from massive infrequent eruptions of gaseous very viscous [[rhyolite]] magma which is rich in [[silicon]], [[potassium]], and [[sodium]] and created the ignimbrite sheets of the [[North Island Volcanic Plateau]]. This central zone has had the largest number of very large silicic caldera-forming eruptions recently on earth.<ref name="Gualda2018">{{Cite journal|title=Climbing the crustal ladder: Magma storage-depth evolution during a volcanic flare-up |first1=Guilherme A. R. |last1=Gualda |first2= Darren M. |last2=Gravley |first3= Michelle |last3=Connor| first4= Brooke |last4=Hollmann |first5= Ayla S. |last5=Pamukcu |first6= Florence |last6=Bégué |first7= Mark S. |last7=Ghiorso |first8=Chad D. |last8=Deering|journal=Science Advances |volume=4 |issue=10 |pages=eaap7567 |year=2018|url= https://www.science.org/doi/pdf/10.1126/sciadv.aap7567?download=true |doi= 10.1126/sciadv.aap7567 |doi-access=free }}</ref> During a period of less than 100,000 years commencing with the massive [[Whakamaru Caldera|Whakamaru eruption]] about 335,000 years ago of greater than {{convert|2000|km3|abbr=on}} [[dense-rock equivalent]] of material, just to the north of the present [[Lake Taupō]], over {{convert|4000|km3|abbr=on}} total was erupted. These eruptions essentially defined the limits of the present [[North Island Volcanic Plateau|central volcanic plateau]], although its current central landscape is mainly a product of later smaller events over the last 200,000 years than the Whakamaru eruption. The other volcanic plateau defining eruptions were to the west, the {{convert|150|km3|abbr=on}} [[Ōkataina Caldera|Matahina eruption]] of about 280,000 years ago, the mainly tephra {{convert|50|km3|abbr=on}} Chimp (Chimpanzee) eruption between 320 and 275 ka, the central {{convert|50|km3|abbr=on}} [[Kapenga Caldera|Pokai eruption]] of about 275 ka, and the paired [[Rotorua Caldera|Mamaku]] to the north and east central [[Ohakuri Caldera|Ohakuri]] eruptions of about 240,000 years ago that together produced more than {{convert|245|km3|abbr=on}} dense-rock equivalent of material.<ref name="Gualda2018"/> The southern [[Taupō Volcano]] [[Oruanui eruption]] about 26,500 years ago produced {{convert|530|km3|abbr=on}} dense-rock equivalent of material and its recent [[Hatepe eruption]] of 232 CE ± 10 years had {{convert|120|km3|abbr=on}} dense-rock equivalent<ref name="Illsley-Kemp 2021"/>. 


The southern part of the zone contain classic volcanic cone structure formed from andesite magma in [[effusive eruption]]s that cool to form dark grey [[lava]] if gas-poor or [[scoria]] if gas-rich of this part of the zone. Mount Ruapehu, the tallest mountain in the North Island, is a {{convert|150|km3|cumi|abbr=on}} andesite cone surrounded by a {{convert|150|km3|cumi|abbr=on}} ring-plain.<ref name="RuapehuTongariro2021Review">{{Cite journal|last1= Leonard|first1=Graham S.|last2=Cole|first2=Rosie P.|last3=Christenson|first3=Bruce W. |last4 = Conway|first4=Chris E.|last5=Cronin|first5=Shane J.|last6=Gamble|first6=John A.|last7=Hurst|first7=Tony|last8=Kennedy|first8=Ben M.|last9= Miller |first9=Craig A.|last10=Procter|first10=Jonathan N.|last11=Pure|first11=Leo R.|last12=Townsend|first12=JDougal B.|last13=White|first13=James D. L.|last14=Wilson|first14=Colin J. N.|date=2021-05-02|title=Ruapehu and Tongariro stratovolcanoes: a review of current understanding|journal= New Zealand Journal of Geology and Geophysics |language=en |volume=64|pages=389–420 |doi=10.1080/00288306.2021.1909080|issue=2–3|s2cid=235502116 |doi-access=free|hdl=10468/11258|hdl-access=free}}</ref> This ring plain is formed from numerous volcanic deposits created by slope failure, eruptions, or [[lahar]]s. Northwest of Ruapehu is [[Hauhungatahi]], the oldest recorded volcano in the south of the plateau,<ref name="RuapehuTongariro2021Review"/> with to the north the two prominent volcanic mountains in the Tongariro volcanic centre being [[Mount Tongariro|Tongariro]] and [[Mount Ngauruhoe|Ngauruhoe]] which are part of a single composite [[stratovolcano]].
Less gaseous [[rhyolite]] magma dome building effusive eruptions have built features such as the [[Horomatangi Reef]]s or [[Motutaiko Island]] in [[Lake Taupō]] or the lava dome of [[Mount Tarawera]]. This later as part of the Ōkataina caldera complex is the highest risk volcanic field in New Zealand to man. <ref name="Doherty2009">{{Cite web|last1=Doherty|first1=Angela Louise |url=https://core.ac.uk/download/pdf/35460853.pdf| title=Blue‐sky eruptions, do they exist? Implications for monitoring New Zealand's volcanoes. |year=2009 |publisher=University of Canterbury|access-date=2022-06-07 }}</ref> [[Mount Tauhara]] adjacent to Lake Taupō is actually a [[dacitic]] dome <ref>[http://www.gns.cri.nz/what/earthact/volcanoes/nzvolcanoes/taupoprint.htm Volcanic Hazards Working Group of the Civil Defence Scientific Advisory Committee, which includes scientists from the Institute of Geological and Nuclear Sciences and the Universities, Number seven "Taupo Volcanic Centre"] {{webarchive|url=https://web.archive.org/web/20061006170713/http://www.gns.cri.nz/what/earthact/volcanoes/nzvolcanoes/taupoprint.htm |date=2006-10-06 }}</ref> and so intermediate in composition between [[andesite]] and [[rhyolite]] but still more viscus than [[basalt]] which is absent from the zone.


The southern part of the zone contain classic volcanic cone structure formed from andesite magma in [[effusive eruption]]s that cool to form dark grey [[lava]] if gas-poor or [[scoria]] if gas-rich of this part of the zone. Mount Ruapehu, the tallest mountain in the North Island, is a {{convert|150|km3|cumi|abbr=on}} andesite cone surrounded by a {{convert|150|km3|cumi|abbr=on}} ring-plain.<ref name="RuapehuTongariro2021Review">{{Cite journal|last1= Leonard|first1=Graham S.|last2=Cole|first2=Rosie P.|last3=Christenson|first3=Bruce W. |last4 = Conway|first4=Chris E.|last5=Cronin|first5=Shane J.|last6=Gamble|first6=John A.|last7=Hurst|first7=Tony|last8=Kennedy|first8=Ben M.|last9= Miller |first9=Craig A.|last10=Procter|first10=Jonathan N.|last11=Pure|first11=Leo R.|last12=Townsend|first12=JDougal B.|last13=White|first13=James D. L.|last14=Wilson|first14=Colin J. N.|date=2021-05-02|title=Ruapehu and Tongariro stratovolcanoes: a review of current understanding|url=https://www.tandfonline.com/doi/full/10.1080/00288306.2021.1909080|journal= New Zealand Journal of Geology and Geophysics |language=en |volume=64|pages=389–420 |doi=10.1080/00288306.2021.1909080|issue=2–3|s2cid=235502116 |doi-access=free}}</ref> This ring plain is formed from numerous volcanic deposits created by slope failure, eruptions, or [[lahar]]s. Northwest of Ruapehu is [[Hauhungatahi]], the oldest recorded volcano in the south of the plateau,<ref name="RuapehuTongariro2021Review"/> with to the north the two prominent volcanic mountains in the Tongariro volcanic centre being [[Mount Tongariro|Tongariro]] and [[Mount Ngauruhoe|Ngāuruhoe]] which are part of a single composite [[stratovolcano]].
===Risks===
===Risks===
[[File:MountTarawera3.jpg|thumb|left|Southwest side of Mount Tarawera, Mount Edgecumbe on the background.]]
[[File:MountTarawera3.jpg|thumb|left|Southwest side of Mount Tarawera, Mount Edgecumbe on the background.]]
The most likely risk is earthquake associated with multiple active faults,<ref name="RotoruaRisk">{{cite web|year=2010 |title=Villamor, P.; Ries, W.; Zajac, A. Rotorua District Council Hazard Studies: Active fault hazards. GNS Science Consultancy Report |url=https://www.rotorualakescouncil.nz/repository/libraries/id:2e3idno3317q9sihrv36/hierarchy/our-services/planningservices/districtplan/districtplan/documents/proposed-district-plan/research/Final-report-CR-2010-182-Active-Fault-hazard.pdf }}</ref> such as within the [[Taupō Fault Belt]], but many faults will be uncharacterised as was the case with the [[1987 Edgecumbe earthquake]].<ref name=Franks1989>{{cite journal |last1=Franks |first1=C.A.M. |last2=Beetham |first2=R.D. |last3=Salt |first3=G.A. |year=1989 |title=Ground damage and seismic response resulting from the 1987 Edgecumbe earthquake, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=32 |issue=1 |pages=135–44 |doi=10.1080/00288306.1989.10421397 }}</ref> Earthquakes can be associated with landslides and inland or coastal [[tsunami]] that can result in great loss of life and both have happened on the [[Waihi Fault Zone]]. <ref name="Tongariro faults">{{cite journal|
The most likely risk is earthquake associated with multiple active faults,<ref name="RotoruaRisk">{{cite web|year=2010 |title=Villamor, P.; Ries, W.; Zajac, A. Rotorua District Council Hazard Studies: Active fault hazards. GNS Science Consultancy Report |url=https://www.rotorualakescouncil.nz/repository/libraries/id:2e3idno3317q9sihrv36/hierarchy/our-services/planningservices/districtplan/districtplan/documents/proposed-district-plan/research/Final-report-CR-2010-182-Active-Fault-hazard.pdf }}</ref> such as within the [[Taupō Fault Belt]], but many faults will be uncharacterised as was the case with the [[1987 Edgecumbe earthquake]].<ref name=Franks1989>{{cite journal |last1=Franks |first1=C.A.M. |last2=Beetham |first2=R.D. |last3=Salt |first3=G.A. |year=1989 |title=Ground damage and seismic response resulting from the 1987 Edgecumbe earthquake, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=32 |issue=1 |pages=135–44 |doi=10.1080/00288306.1989.10421397 |doi-access=free }}</ref> Earthquakes can be associated with landslides and inland or coastal [[tsunami]] that can result in great loss of life and both have happened on the [[Waihi Fault Zone]].<ref name="Tongariro faults">{{cite journal|
last1=Gómez‐Vasconcelos |first1=Martha |last2=Villamor |first2=Pilar |last3=Procter |first3=Jon |last4=Palmer |first4=Alan |last5=Cronin |first5=Shane |last6=Wallace |first6=Clel |last7=Townsend |first7=Dougal |last8=Leonard |first8=Graham|year=2018 |title=Characterisation of faults as earthquake sources from geomorphic data in the Tongariro Volcanic Complex, New Zealand
last1=Gómez-Vasconcelos |first1=Martha |last2=Villamor |first2=Pilar |last3=Procter |first3=Jon |last4=Palmer |first4=Alan |last5=Cronin |first5=Shane |last6=Wallace |first6=Clel |last7=Townsend |first7=Dougal |last8=Leonard |first8=Graham|year=2018 |title=Characterisation of faults as earthquake sources from geomorphic data in the Tongariro Volcanic Complex, New Zealand
|doi=10.1080/00288306.2018.1548495 |journal=New Zealand Journal of Geology and Geophysics |volume=62 |pages=131–142 |s2cid=134094861 |url=https://www.researchgate.net/publication/329382912 }}</ref> The relative low grade volcanic activity of the andesite volcanoes at each end of the zone has resulted in recorded history in both direct loss of life and disrupted transport and tourism. The only high grade eruption in recorded history was atypically basaltic from [[Mount Tarawera]] and although very destructive is not likely to be a perfect model for the more typical and often larger rhyolitic events associated with the [[Taupō Volcano]] and the [[Ōkataina Caldera]].<ref name="Darragh2004">{{cite thesis|first1=Miles Benson |last1=Darragh |year=2004 |title= Eruption Processes of the Okareka and Rerewhakaaitu eruption episodes; Tarawera Volcano, New Zealand |url=https://ir.canterbury.ac.nz/bitstream/handle/10092/104014/Darragh_thesis.pdf?sequence=1&isAllowed=y }}</ref> As mentioned earlier the Ōkataina caldera complex is the highest risk volcanic field risk in New Zealand to man<ref name="Doherty2009"/> and the recent frequency of rhyolitic events there is not reassuring, along with the timescale of likely warning of such an event.<ref name="Darragh2004"/> These eruptions are associated with [[tephra]] production that results in deep ash fall over wide areas (e.g. the Whakatane eruption of ~ 5500 years ago had {{convert|5|mm|abbr=on}} ashfall {{convert|900|km|abbr=on}} away on the [[Chatham Islands]]) `<ref name="Holt2011">{{cite journal|first1=Katherine A. |last1=Holt |first2=David J. |last2=Lowe |first3=Alan G. |last3=Hogg |first4=R. Clel |last4=Wallace |title=Distal occurrence of mid-Holocene Whakatane Tephra on the Chatham Islands, New Zealand, and potential for cryptotephra studies |journal=Quaternary International |volume=246 |issue=1–2 |year=2011 |pages=344–351 |issn=1040-6182 |doi=10.1016/j.quaint.2011.06.026 |hdl=10289/5454 |url=https://www.sciencedirect.com/science/article/pii/S1040618211003454 |hdl-access=free }}</ref> pyroclastic flows and surges, which rarely have covered large areas of the [[North Island]] in [[ignimbrite]] sheets, earthquakes, lake tsunamis, prolonged lava dome growth and associated block and ash flows with post-eruption lahars and flooding.<ref name="Darragh2004"/>
|doi=10.1080/00288306.2018.1548495 |journal=New Zealand Journal of Geology and Geophysics |volume=62 |pages=131–142 |s2cid=134094861 |url=https://www.researchgate.net/publication/329382912 }}</ref> The relative low grade volcanic activity of the andesite volcanoes at each end of the zone has resulted in recorded history in both direct loss of life and disrupted transport and tourism. The only high grade eruption in recorded history was atypically basaltic from [[Mount Tarawera]] and although very destructive is not likely to be a perfect model for the more typical and often larger rhyolitic events associated with the [[Taupō Volcano]] and the [[Ōkataina Caldera]].<ref name="Darragh2004">{{cite thesis|first1=Miles Benson |last1=Darragh |year=2004 |title= Eruption Processes of the Okareka and Rerewhakaaitu eruption episodes; Tarawera Volcano, New Zealand |url=https://ir.canterbury.ac.nz/bitstream/handle/10092/104014/Darragh_thesis.pdf?sequence=1&isAllowed=y }}</ref> As mentioned earlier the Ōkataina caldera complex is the highest risk volcanic field risk in New Zealand to man<ref name="Doherty2009"/> and the recent frequency of rhyolitic events there is not reassuring, along with the timescale of likely warning of such an event.<ref name="Darragh2004"/> These eruptions are associated with [[tephra]] production that results in deep ash fall over wide areas (e.g. the Whakatane eruption of ~ 5500 years ago had {{convert|5|mm|abbr=on}} ashfall {{convert|900|km|abbr=on}} away on the [[Chatham Islands]]) `<ref name="Holt2011">{{cite journal|first1=Katherine A. |last1=Holt |first2=David J. |last2=Lowe |first3=Alan G. |last3=Hogg |first4=R. Clel |last4=Wallace |title=Distal occurrence of mid-Holocene Whakatane Tephra on the Chatham Islands, New Zealand, and potential for cryptotephra studies |journal=Quaternary International |volume=246 |issue=1–2 |year=2011 |pages=344–351 |issn=1040-6182 |doi=10.1016/j.quaint.2011.06.026 |hdl=10289/5454 |url=https://www.sciencedirect.com/science/article/pii/S1040618211003454 |hdl-access=free }}</ref> pyroclastic flows and surges, which rarely have covered large areas of the [[North Island]] in [[ignimbrite]] sheets, earthquakes, lake tsunamis, prolonged lava dome growth and associated block and ash flows with post-eruption lahars and flooding.<ref name="Darragh2004"/>
<div style="float:right;">
<div style="float:right;">
<!--Sources Smithsonian volcano.si.edu/volcano.cfm?vn=241070 and Lowe et al 2017 with other detail from references quoted in this article. The latest corrected data is from Lowe's group eg https://www.researchgate.net/publication/368275732_Pre-conference_tephra_data_workshop_-_Hands-on_session_II_tephra_excursion_Okareka_Loop_Road_29_January_2023 and for Oruanui Eruption Dong, Xiyu; Kathayat, Gayatri; Rasmussen, Sune O.; Svensson, Anders; Severinghaus, Jeffrey P.; Li, Hanying; Sinha, Ashish; Xu, Yao; Zhang, Haiwei; Shi, Zhengguo; Cai, Yanjun; Pérez-Mejías, Carlos; Baker, Jonathan; Zhao, Jingyao; Spötl, Christoph (4 October 2022). "Coupled atmosphere-ice-ocean dynamics during Heinrich Stadial 2". Nature Communications. 13 (1): 5867. doi:10.1038/s41467-022-33583-4.
<!--Sources Smithsonian volcano.si.edu/volcano.cfm?vn=241070 and Lowe et al 2017 with other detail from references quoted in this article
eruptive volumes from Wilson, C. J. N.; Gravley, D. M.; Leonard, G. S.; Rowland, J. V. (2009). Thordarson, T.; Self, S.; Larsen, G.; Rowland, S. K.; Hoskuldsson, A. (eds.). Volcanism in the central Taupo Volcanic Zone, New Zealand: tempo,styles and controls. Geological Society of London. pp. 226–231. Poihihi from https://eprints.whiterose.ac.uk/116162/1/Allan et al Oruanui paper revised manuscript clean and complete%28002%29.pdf
eruptive volumes from Wilson, C. J. N.; Gravley, D. M.; Leonard, G. S.; Rowland, J. V. (2009). Thordarson, T.; Self, S.; Larsen, G.; Rowland, S. K.; Hoskuldsson, A. (eds.). Volcanism in the central Taupo Volcanic Zone, New Zealand: tempo, styles and controls. Geological Society of London. pp. 226–231. Poihihi from https://eprints.whiterose.ac.uk/116162/1/Allan et al Oruanui paper revised manuscript clean and complete%28002%29.pdf
Elms in her 2022 thesis https://openaccess.wgtn.ac.nz/articles/thesis/Geochemistry_Magmatic_Processes_and_Timescales_of_Recent_Rhyolitic_Eruptives_of_the_kataina_Volcanic_Centre_Taup_Volcanic_Zone_Aotearoa_New_Zealand/20220117?file=36139302 also gives a useful table and analysis of timing discrepancies from Willson's group. This identified an unexplained disagreement by about 2000 odd years in the timing of the Okareka eruption between Lowes and Villmours group and Shane/Willsons Group. This caused update confusion now corrected in timeline for Tarawera dates. See also
Timings of Tarawera eruptions up dated from:
Shane 2006 Pyroclastic stratigraphy and eruption dynamics of the 21.9 ka Okareka and 17.6 ka Rerewhakaaitu eruption episodes from Tarawera Volcano, Okataina Volcanic Centre, New Zealand | url=https://www.tandfonline.com/doi/pdf/10.1080/00288306.2006.9515170
Shane 2006 Pyroclastic stratigraphy and eruption dynamics of the 21.9 ka Okareka and 17.6 ka Rerewhakaaitu eruption episodes from Tarawera Volcano, Okataina Volcanic Centre, New Zealand | url=https://www.tandfonline.com/doi/pdf/10.1080/00288306.2006.9515170
Shane 2007 Multiple rhyolite magmas and basalt injection in the 17.7 ka Rerewhakaaitu eruption episode from Tarawera volcanic complex, New Zealand
Shane 2007 Multiple rhyolite magmas and basalt injection in the 17.7 ka Rerewhakaaitu eruption episode from Tarawera volcanic complex, New Zealand


This table has hopefully been corrected for the base used for BP(before present) of the year 1950. Many of the timings for the period 2000 BP and earlier are being refined since 2000 CE odd and the default source Smithsonian Volcano has not kept up. Where there is a descripancy an original more recent source has likely been discovered.
This table has hopefully been corrected from the base used for BP(before present) of the year 1950. Many of the timings for the period 2000 BP and earlier are being refined since 2000 CE odd and the default source Smithsonian Volcano has not kept up. Where there is a descripancy an original more recent source has likely been discovered.
---->
---->
<!---Excludes Tuhua Tephra (from Mayor Island approximately 6200 BCE) and Okupata Tepra from Taranaki 9750 BCE---->
<!---Excludes Tuhua Tephra (from Mayor Island approximately 6200 BCE) and Okupata Tepra from Taranaki 9750 BCE---->
Line 747: Line 761:
at:-29999 shift:(0,-5) text: Selected eruptions Taupō Volcanic Zone
at:-29999 shift:(0,-5) text: Selected eruptions Taupō Volcanic Zone
at:2500 shift:(0,-4) text: Selected eruptions Taupō Volcanic Zone
at:2500 shift:(0,-4) text: Selected eruptions Taupō Volcanic Zone
at:-29750 shift:(40,-5) fontsize:XS text: Note - The further back in time, the larger an eruption
at:-29750 shift:(40,-5) fontsize:XS text: Note The further back in time, the larger an eruption
at:-29600 shift:(40,-5) fontsize:XS text: must be, to be detected. Accordingly interpret with caution
at:-29600 shift:(40,-5) fontsize:XS text: must be, to be detected. Accordingly interpret with caution
at:-29450 shift:(40,-3) fontsize:XS text: as eruptive indices are based for many eruptions on tepra
at:-29450 shift:(40,-3) fontsize:XS text: as eruptive indices are based for many eruptions on tepra
Line 761: Line 775:
at:-26435 shift:(217,-11) textcolor:red fontsize:S text:(1.5 km )
at:-26435 shift:(217,-11) textcolor:red fontsize:S text:(1.5 km )
at:-26435 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-26435 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-23558 shift:(10,-3) fontsize:XS text:[[Oruanui eruption| 23558&nbsp;BCE Taupō Oruanui eruption]]
at:-25675 shift:(10,-3) fontsize:XS text:[[Oruanui eruption| 25675&nbsp;BCE Taupō Oruanui eruption]]
at:-23558 shift:(215,-11) textcolor:red fontsize:S text:(530 km )
at:-25675 shift:(215,-11) textcolor:red fontsize:S text:(530 km )
at:-23558 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-25675 shift:(253,-9) textcolor:red fontsize:XS text:3
bar:test at:-23558 mark:(line,red)
bar:test at:-25675 mark:(line,red)
at:-19950 shift:(10,-3) fontsize:XS text:[[Mount Tarawera| 19950&nbsp;BCE Ōkataina Okareka]]
at:-23221 shift:(10,-3) fontsize:XS text:[[Ōkareka Embayment| 23221&nbsp;BCE Te Rere eruption]]
at:-23221 shift:(212,-11) textcolor:red fontsize:S text:(11.5 km)
bar:test at:-19950 mark:(line,red)
at:-19950 shift:(226,-11) textcolor:red fontsize:S text:(5 km )
at:-23221 shift:(255,-9) textcolor:red fontsize:XS text:3
bar:test at:-23221 mark:(line,red)
at:-19950 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-15750 shift:(10,-3) fontsize:XS text:[[Mount Tarawera| 17700&nbsp;BCE Ōkataina Rerewhakaaitu]]
at:-21575 shift:(10,-3) fontsize:XS text:[[Mount Tarawera| 21575&nbsp;BCE Ōkataina Okareka]]
bar:test at:-15750 mark:(line,red)
bar:test at:-21575 mark:(line,red)
at:-15750 shift:(226,-11) textcolor:red fontsize:S text:(8 km )
at:-21575 shift:(226,-11) textcolor:red fontsize:S text:(5 km )
at:-15750 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-21575 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-13750 shift:(10,-3) fontsize:XS text:[[Ōkataina Caldera| 13600&nbsp;BCE Ōkataina Rotorua]]
at:-15546 shift:(10,-3) fontsize:XS text:[[Mount Tarawera| 15546&nbsp;BCE Ōkataina Rerewhakaaitu]]
bar:test at:-13750 mark:(line,red)
bar:test at:-15546 mark:(line,red)
at:-13750 shift:(226,-11) textcolor:red fontsize:S text:(4 km )
at:-15546 shift:(226,-11) textcolor:red fontsize:S text:(8 km )
at:-13750 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-15546 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-11850 shift:(10,-3) fontsize:XS text:[[Mount Tarawera| 12000 Ōkataina Waiohau]]
at:-13685 shift:(10,-3) fontsize:XS text:[[Ōkataina Caldera| 13685&nbsp;BCE Ōkataina Rotorua]]
bar:test at:-11850 mark:(line,red)
bar:test at:-13685 mark:(line,red)
at:-11850 shift:(220,-11) textcolor:red fontsize:S text:(11 km )
at:-13685 shift:(226,-11) textcolor:red fontsize:S text:(4 km )
at:-11850 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-13685 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-9460 shift:(10,-3) fontsize:XS text:[[Taupō Volcano| 9460&nbsp;BCE Taupō East/Central Unit B]]
at:-12059 shift:(10,-3) fontsize:XS text:[[Mount Tarawera| 12059&nbsp;BCE Ōkataina Waiohau]]
bar:test at:-12059 mark:(line,red)
at:-12059 shift:(220,-11) textcolor:red fontsize:S text:(11 km )
at:-12059 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-9460 shift:(10,-8) fontsize:XS text:[[Taupō Volcano| 9460&nbsp;BCE Taupō East/Central Unit B]]
bar:test at:-9460 mark:(line,red)
bar:test at:-9460 mark:(line,red)
at:-9460 shift:(217,-11) textcolor:red fontsize:S text:(0.5 km )
at:-9460 shift:(217,-16) textcolor:red fontsize:S text:(0.5 km )
at:-9460 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-9460 shift:(253,-14) textcolor:red fontsize:XS text:3
at:-9240 shift:(10,1) fontsize:XS text:[[Taupō Volcano| 9240&nbsp;BCE Taupō Te Kohaiakatu Pt Unit C]]
at:-9240 shift:(10,1) fontsize:XS text:[[Taupō Volcano| 9240&nbsp;BCE Taupō Te Kohaiakatu Pt Unit C]]
bar:test at:-9240 mark:(line,red)
bar:test at:-9240 mark:(line,red)
Line 795: Line 813:
at:-8130 shift:(226,-11) textcolor:red fontsize:S text:(2 km )
at:-8130 shift:(226,-11) textcolor:red fontsize:S text:(2 km )
at:-8130 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-8130 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-7412 shift:(10,-2) fontsize:XS text:[[Ōkataina Caldera| 7412&nbsp;BCE Ōkataina Rotoma]]
at:-7473 shift:(10,-2) fontsize:XS text:[[Ōkataina Caldera| 7473&nbsp;BCE Ōkataina Rotoma]]
bar:test at:-7412 mark:(line,red)
bar:test at:-7473 mark:(line,red)
at:-7412 shift:(226,-11) textcolor:red fontsize:S text:(8 km )
at:-7473 shift:(226,-11) textcolor:red fontsize:S text:(8 km )
at:-7412 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-7473 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-5929 shift:(10,-2) fontsize:XS text:[[Ōkataina Caldera| 5929&nbsp;BCE Ōkataina Mamaku]]
at:-5990 shift:(10,-2) fontsize:XS text:[[Ōkataina Caldera| 5990&nbsp;BCE Ōkataina Mamaku]]
bar:test at:-5929 mark:(line,red)
bar:test at:-5990 mark:(line,red)
at:-5929 shift:(212,-11) textcolor:red fontsize:S text:(17.5 km )
at:-5990 shift:(212,-11) textcolor:red fontsize:S text:(17.5 km )
at:-5929 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-5990 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-5100 shift:(10,-2) fontsize:XS text:[[Taupō Volcano| 5100&nbsp;BCE Taupō Motutaiko Island Unit F]]
at:-5100 shift:(10,-2) fontsize:XS text:[[Taupō Volcano| 5100&nbsp;BCE Taupō Motutaiko Island Unit F]]
bar:test at:-5100 mark:(line,red)
bar:test at:-5100 mark:(line,red)
Line 817: Line 835:
at:-4000 shift:(10,-2) fontsize:XS text:[[Taupō Volcano| 4000&nbsp;BCE Taupō Unit I]]
at:-4000 shift:(10,-2) fontsize:XS text:[[Taupō Volcano| 4000&nbsp;BCE Taupō Unit I]]
bar:test at:-4000 mark:(line,red)
bar:test at:-4000 mark:(line,red)
at:-3550 shift:(10,-4) fontsize:XS text:[[Ōkataina Caldera| 3550&nbsp;BCE Ōkataina Whakatane]]
at:-3576 shift:(10,-4) fontsize:XS text:[[Ōkataina Caldera| 3576&nbsp;BCE Ōkataina Whakatane]]
bar:test at:-3550 mark:(line,red)
bar:test at:-3576 mark:(line,red)
at:-3550 shift:(220,-11) textcolor:red fontsize:S text:(17 km )
at:-3576 shift:(220,-11) textcolor:red fontsize:S text:(17 km )
at:-3550 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-3576 shift:(253,-9) textcolor:red fontsize:XS text:3
at:-3420 shift:(10,-4) fontsize:XS text:[[Taupō Volcano| 3420&nbsp;BCE Taupō Unit J]]
at:-3420 shift:(10,-4) fontsize:XS text:[[Taupō Volcano| 3420&nbsp;BCE Taupō Unit J]]
bar:test at:-3420 mark:(line,red)
bar:test at:-3420 mark:(line,red)
Line 896: Line 914:
at:-3170 frompos:280 tillpos:320 color:red width:2
at:-3170 frompos:280 tillpos:320 color:red width:2
at:-3420 frompos:290 tillpos:320 color:red width:2
at:-3420 frompos:290 tillpos:320 color:red width:2
at:-3550 frompos:270 tillpos:320 color:red width:2
at:-3576 frompos:270 tillpos:320 color:red width:2
at:-4000 frompos:290 tillpos:320 color:red width:2
at:-4000 frompos:290 tillpos:320 color:red width:2
at:-4100 frompos:280 tillpos:320 color:red width:2
at:-4100 frompos:280 tillpos:320 color:red width:2
at:-4700 frompos:280 tillpos:320 color:red width:2
at:-4700 frompos:280 tillpos:320 color:red width:2
at:-5100 frompos:290 tillpos:320 color:red width:2
at:-5100 frompos:290 tillpos:320 color:red width:2
at:-5929 frompos:270 tillpos:320 color:red width:2
at:-5990 frompos:270 tillpos:320 color:red width:2
at:-7412 frompos:260 tillpos:320 color:red width:2
at:-7473 frompos:260 tillpos:320 color:red width:2
at:-8130 frompos:270 tillpos:320 color:red width:2
at:-8130 frompos:270 tillpos:320 color:red width:2
at:-9210 frompos:280 tillpos:320 color:red width:2
at:-9210 frompos:280 tillpos:320 color:red width:2
at:-9240 frompos:270 tillpos:320 color:red width:2
at:-9240 frompos:270 tillpos:320 color:red width:2
at:-9460 frompos:270 tillpos:320 color:red width:2
at:-9460 frompos:270 tillpos:320 color:red width:2
at:-11850 frompos:270 tillpos:320 color:red width:2
at:-12059 frompos:270 tillpos:320 color:red width:2
at:-13750 frompos:270 tillpos:320 color:red width:2
at:-13685 frompos:270 tillpos:320 color:red width:2
at:-15750 frompos:270 tillpos:320 color:red width:2
at:-15546 frompos:270 tillpos:320 color:red width:2
at:-19950 frompos:270 tillpos:320 color:red width:2
at:-21575 frompos:270 tillpos:320 color:red width:2
at:-23558 frompos:240 tillpos:320 color:red width:2
at:-23221 frompos:270 tillpos:320 color:red width:2
at:-25675 frompos:240 tillpos:320 color:red width:2
at:-26435 frompos:270 tillpos:320 color:red width:2
at:-26435 frompos:270 tillpos:320 color:red width:2
</timeline>
</timeline>
</div>
</div>

==Volcanoes, lakes and geothermal fields==
==Volcanoes, lakes and geothermal fields==
{{See also|List of volcanoes in New Zealand#Taupō Volcanic Zone}}
{{See also|List of volcanoes in New Zealand#Taupō Volcanic Zone}}


{{GeoGroup}}
{{GeoGroup}}
{{#tag:mapframe|{{Wikipedia:Map data/Taupō Volcanic Zone}}
{{maplink|frame=yes
| frameless =1
|frame-align=right
| align =right
|text=Map of selected volcanic features as rectangular symbols for the Taupō Volcanic Zone. Volcanoes classified as active are shown as red, other notable volcanoes (there are many more) are shown as orange, geothermal areas as light blue and if active hydrothermal eruptions as blue. It is possible by clicking on the map to get a full screen view that enables mouseover to show a label (often wiki-linked) for each symbol.
| text =Map of selected volcanic features as rectangular symbols for the Taupō Volcanic Zone. Volcanoes classified as active are shown as red, other notable volcanoes (there are many more) are shown as orange, geothermal areas as light blue and if active hydrothermal eruptions as blue. It is possible by clicking on the map to get a full screen view that enables mouseover to show a label (often wiki-linked) for each symbol.
|raw={{Wikipedia:Map data/Taupō Volcanic Zone}}
|frame-width=300
| width =300
|frame-height=360
| height =360
|frame-lat=-38.2
| latitude =-38.2
|frame-long=176.3
| longitude =176.3
|zoom=7
| zoom =7
}}
}}
{{#tag:mapframe|{{Wikipedia:Map data/Northern North Island Volcanics}}
{{maplink|frame=yes
| frameless =1
|frame-align=right
| align =right
|text=Map of selected surface volcanic deposits centered on the Taupō Volcanic Zone, allowing wider volcanic context. Clicking on the map enlarges it, and enables panning and mouseover of volcanic deposits name/wikilink and ages before present. The key to the shading of the volcanics that are shown is rhyolite - violet, ignimbrite - lighter shades of violet, dacite - purple, [[basalt]] - brown, [[Monogenetic volcanic field|monogenetic]] basalts - dark brown, undifferentiated basalts of the Tangihua Complex in Northland Allochthon - light brown, arc basalts - deep orange brown, arc ring basalts -orange brown, [[andesite]] - red , basaltic andesite`- light red, and plutonic - gray. White shading has been used for postulated calderas (usually subsurface now).
| text =Map of selected surface volcanic deposits centred on the Taupō Volcanic Zone, allowing wider volcanic context. Clicking on the map enlarges it, and enables panning and mouseover of volcanic deposits name/wikilink and ages before present. The key to the shading of the volcanics that are shown is rhyolite violet, ignimbrite lighter shades of violet, dacite purple, [[basalt]] brown, [[Monogenetic volcanic field|monogenetic]] basalts dark brown, undifferentiated basalts of the Tangihua Complex in Northland Allochthon light brown, arc basalts deep orange brown, arc ring basalts -orange brown, [[andesite]] red, basaltic andesite`- light red, and plutonic gray. White shading has been used for postulated calderas (usually subsurface now).
|raw={{Wikipedia:Map data/Northern North Island Volcanics}}
|frame-width=300
| width =300
|frame-height=360
| height =360
|frame-lat=-38.2
| latitude =-38.2
|frame-long=176.3
| longitude =176.3
| zoom =7
|icon=no
| icon =no
|zoom=7
}}
}}
The following Volcanic Centers belong to the modern Taupō Volcanic Zone:
The following Volcanic Centres belong to the modern Taupō Volcanic Zone in what proved to be an evolving classification scheme:
[[File:Rotorua.Caldera.Mount.Tarawera.JPG|thumb|Satellite view of the Lake Rotorua Caldera. Mount Tarawera is in the lower right corner.]]
[[File:Rotorua.Caldera.Mount.Tarawera.JPG|thumb|Satellite view of the Lake Rotorua Caldera. Mount Tarawera is in the lower right corner.]]
[[File:Lake taupo landsat & volcanic features.jpg|thumb|Recent major volcanic features Lake Taupō showing relationship to recent volcanic vents in red and present active geothermal systems in light blue.]]
[[File:Lake taupo landsat & volcanic features.jpg|thumb|Recent major volcanic features Lake Taupō showing relationship to recent volcanic vents in red and present active geothermal systems in light blue.]]
[[File:MtRuapehu 23oct2002.jpg|thumb|Composite satellite image of [[Mount Ruapehu]]]]
[[File:MtRuapehu 23oct2002.jpg|thumb|Composite satellite image of [[Mount Ruapehu]]]]


Rotorua, Ōkataina , Maroa, Taupō, Tongariro and Mangakino.<ref>{{Cite journal |doi=10.1007/BF00268925 |last=Cole |first=J.W. |s2cid=129091056 |title=Structural control and origin of volcanism in the Taupo volcanic zone, New Zealand |year=1990 |journal=Bulletin of Volcanology |volume=52 |pages=445–459 |bibcode=1990BVol...52..445C |issue=6}}</ref><ref>{{cite web |url=http://volcano.oregonstate.edu/vwdocs/volc_images/australia/new_zealand/ |title=New Zealand}}</ref> The old zone almost certainly contains volcanoes in the [[Tauranga Volcanic Centre]].<ref name="Pittari2021">{{cite journal|first1=Adrian |last1=Pittari |first2=Marlena L. |last2=Prentice |first3= Oliver E. |last3=McLeod |first4= Elham Yousef|last4=Zadeh |first5= Peter J. J. |last5=Kamp |first6= Martin |last6=Danišík |first7=Kirsty A. |last7=Vincent |year=2021 |title= Inception of the modern North Island (New Zealand) volcanic setting: spatio-temporal patterns of volcanism between 3.0 and 0.9 Ma |journal= New Zealand Journal of Geology and Geophysics |volume=64 |issue=2-3 |pages= 250–272 | DOI=10.1080/00288306.2021.1915343|url=https://fl-nzgs-media.s3.amazonaws.com/uploads/2021/08/Ref.6C-c_North-Island-NZ-VolcanicSettingBetween3.00.9MaPittari-et-al.-2021_.pdf }} </ref>
Rotorua, Ōkataina, Maroa, Taupō, Tongariro and Mangakino.<ref>{{Cite journal |doi=10.1007/BF00268925 |last=Cole |first=J.W. |s2cid=129091056 |title=Structural control and origin of volcanism in the Taupo volcanic zone, New Zealand |year=1990 |journal=Bulletin of Volcanology |volume=52 |pages=445–459 |bibcode=1990BVol...52..445C |issue=6}}</ref><ref>{{cite web |url=http://volcano.oregonstate.edu/vwdocs/volc_images/australia/new_zealand/ |title=New Zealand}}</ref> The old zone almost certainly contains volcanoes in the [[Tauranga Volcanic Centre]].<ref name="Pittari2021">{{cite journal|first1=Adrian |last1=Pittari |first2=Marlena L. |last2=Prentice |first3= Oliver E. |last3=McLeod |first4= Elham Yousef|last4=Zadeh |first5= Peter J. J. |last5=Kamp |first6= Martin |last6=Danišík |first7=Kirsty A. |last7=Vincent |year=2021 |title= Inception of the modern North Island (New Zealand) volcanic setting: spatio-temporal patterns of volcanism between 3.0 and 0.9 Ma |journal= New Zealand Journal of Geology and Geophysics |volume=64 |issue=2–3 |pages= 250–272 | doi=10.1080/00288306.2021.1915343|s2cid=235736318 |url=https://fl-nzgs-media.s3.amazonaws.com/uploads/2021/08/Ref.6C-c_North-Island-NZ-VolcanicSettingBetween3.00.9MaPittari-et-al.-2021_.pdf }}</ref>
*'''[[Tauranga Volcanic Centre]] – Bay of Plenty'''
*'''[[Tauranga Volcanic Centre]] – Bay of Plenty'''
**Activity commenced here over two million years ago and is now extinct.
**Activity commenced here over two million years ago and is now extinct.
Line 958: Line 978:
***[[Kawerau Power Station]] {{coord|-38.0631|176.7271|format=dms|region:NZ_type:landmark|name=Kawerau Power Station}}
***[[Kawerau Power Station]] {{coord|-38.0631|176.7271|format=dms|region:NZ_type:landmark|name=Kawerau Power Station}}
*'''[[:Category:Rotorua Volcanic Centre|Rotorua Volcanic Centre]]'''
*'''[[:Category:Rotorua Volcanic Centre|Rotorua Volcanic Centre]]'''
**[[Rotorua caldera|Rotorua Caldera]], size: 22&nbsp;km wide {{coord|38.08|S|176.27|E|format=dms|type:mountain|name=Rotorua Caldera}}<ref name="largeeruptions">{{Cite web |title=Large Holocene Eruptions |url=https://volcano.si.edu/world/largeeruptions.cfm |archive-url=https://web.archive.org/web/20120415150234/http://www.volcano.si.edu/world/largeeruptions.cfm |archive-date=2021-04-15 |website=Global Volcanism Program}}</ref>
**[[Rotorua caldera|Rotorua Caldera]], size: 22&nbsp;km wide {{coord|38.08|S|176.27|E|format=dms|type:mountain|name=Rotorua Caldera}}<ref name="largeeruptions">{{Cite web |title=Large Holocene Eruptions |url=https://volcano.si.edu/world/largeeruptions.cfm |archive-url=https://web.archive.org/web/20120415150234/http://www.volcano.si.edu/world/largeeruptions.cfm |archive-date=2012-04-15 |website=Global Volcanism Program}}</ref>
**[[Ngongotahā#Mount Ngongotahā|Mount Ngongotahā]] {{coord|-38.118973|176.198095|display=inline}}
**[[Ngongotahā#Mount Ngongotahā|Mount Ngongotahā]] {{coord|-38.118973|176.198095|display=inline}}
**Lakes
**Lakes
Line 967: Line 987:
***[[Whakarewarewa]] {{coord|38|9|44|S|176|15|23|E|format=dms|type:landmark_region:NZ_source:dewiki|name=Whakarewarewa}}
***[[Whakarewarewa]] {{coord|38|9|44|S|176|15|23|E|format=dms|type:landmark_region:NZ_source:dewiki|name=Whakarewarewa}}
****[[Pōhutu Geyser]] (Te Puia)
****[[Pōhutu Geyser]] (Te Puia)
*[[:Category:Okataina Volcanic Centre|'''Ōkataina Volcanic Centre''']]: The Haroharo and Tarawera complexes impounded the lakes against the outer margins of the [[Ōkataina Caldera]]. The [[Okareka Embayment]] and the Tarawera Volcanic Complex are inside the [[Haroharo Caldera]] which in turn is inside the Okataina Ring Structure, from Newhall (1988),<ref>{{Cite journal|last1=Newhall|first1=Christopher G.|last2=Dzurisin|first2=Daniel|year=1988|title=Historical unrest at large calderas of the world|url=https://pubs.er.usgs.gov/usgspubs/b/b1855|journal=USGS Bulletin|volume=1855|page=1108}} Citing {{Cite journal|last=Scott|first=B.J.|year=1986|editor1-last=Gregory|editor1-first=J.G.|editor2-last=Watters|editor2-first=W.A.|title=Volcanic hazards assessment in New Zealand: Monitoring at Okataina Volcanic Centre|journal=New Zealand Geol. Surv. Rec.|volume=10|pages=49–54}}</ref> but newer maps show Okataina smaller.
*[[:Category:Okataina Volcanic Centre|'''Ōkataina Volcanic Centre''']]: The Haroharo and Tarawera complexes impounded the lakes against the outer margins of the [[Ōkataina Caldera]]. The [[Okareka Embayment]] and the Tarawera Volcanic Complex were placed inside the [[Haroharo Caldera]] which in turn is inside the Okataina Ring Structure, according to Newhall (1988),<ref>{{Cite journal|last1=Newhall|first1=Christopher G.|last2=Dzurisin|first2=Daniel|year=1988|title=Historical unrest at large calderas of the world|url=https://pubs.er.usgs.gov/usgspubs/b/b1855|journal=USGS Bulletin|volume=1855|page=1108}} Citing {{Cite journal|last=Scott|first=B.J.|year=1986|editor1-last=Gregory|editor1-first=J.G.|editor2-last=Watters|editor2-first=W.A.|title=Volcanic hazards assessment in New Zealand: Monitoring at Okataina Volcanic Centre|journal=New Zealand Geol. Surv. Rec.|volume=10|pages=49–54}}</ref> but this was reclassified by Cole (2009).<ref name="Cole2009"/>
**[[Ōkataina Caldera]], size: roughly 27 x 20&nbsp;km {{coord|38.22|S|176.5|E|format=dms|type:mountain|name=Okataina Caldera}}<ref>[http://volcano.oregonstate.edu/vwdocs/volc_images/img_tarawera.html Okataina Volcanic Center, New Zealand]</ref>
**[[Ōkataina Caldera]], size: roughly 27 x 20&nbsp;km {{coord|38.22|S|176.5|E|format=dms|type:mountain|name=Okataina Caldera}}<ref>[http://volcano.oregonstate.edu/vwdocs/volc_images/img_tarawera.html Okataina Volcanic Center, New Zealand]</ref>
***[[Haroharo Caldera]], size: 16 x 26&nbsp;km<ref name="largeeruptions" />
***[[Haroharo Caldera|Haroharo volcanic complex]], northern end of the Okataina Volcanic Centre<ref name="largeeruptions" /> with infilling of several sub-caldera's from caldera forming eruptions:
****[[Rotoiti Caldera]]
****Haroharo volcanic complex, northern end of the Okataina Volcanic Center
****[[Matahina Caldera]]
****[[Utu Caldera]]
****[[Mount Tarawera]] and Tarawera volcanic complex {{coord|38.22|S|176.5|E|format=dms|type:mountain|name=Mount Tarawera}}
****[[Mount Tarawera]] and Tarawera volcanic complex {{coord|38.22|S|176.5|E|format=dms|type:mountain|name=Mount Tarawera}}
*****Okareka vent<ref>{{Cite book |last=Nairn |first=I.A. |year=2002 |title=Geology of the Okatania Volcanic Centre |publisher=Institute of Geological and Nuclear Sciences |series=Geological Map 25 |page=156 }}</ref>
*****Okareka vent<ref>{{Cite book |last=Nairn |first=I.A. |year=2002 |title=Geology of the Okatania Volcanic Centre |publisher=Institute of Geological and Nuclear Sciences |series=Geological Map 25 |page=156 }}</ref>
****[[Puhipuhi Embayment]]
****[[Ōkareka Embayment]] {{coord|-38.20215|176.348291|type:mountain|format=dms|display=inline}}
****[[Ōkareka Embayment]] {{coord|-38.20215|176.348291|type:mountain|format=dms|display=inline}}
**[[Rotomā Caldera]]<ref name="Plenty">{{Cite journal |last1=Hodgson |first1=K. A. |last2=Nairn |first2=I. A. |date=August 2004 |title=The Sedimentation and Drainage History of Haroharo Caldera and The Tarawera River System, Taupo Volcanic Zone, New Zealand |journal=Operations Publication 2004/03 |publisher=Environment Bay of Plenty |issn=1176-5550 |page=7 |url=http://www.envbop.govt.nz/Reports/Report-0408-TheSedimentationAndDrainageHistoryOfHaroharoCalderaAndTheTaraweraRiverSystemTaupoVolcanicZoneNewZealand.pdf |archive-url=https://web.archive.org/web/20100522220029/http://www.envbop.govt.nz/Reports/Report-0408-TheSedimentationAndDrainageHistoryOfHaroharoCalderaAndTheTaraweraRiverSystemTaupoVolcanicZoneNewZealand.pdf |url-status=dead |archive-date=2010-05-22 }}</ref> {{coord|38|05|S|176|35|E|format=dms|display=inline}}
****[[Rotomā Caldera]]<ref name="Plenty">{{Cite journal |last1=Hodgson |first1=K. A. |last2=Nairn |first2=I. A. |date=August 2004 |title=The Sedimentation and Drainage History of Haroharo Caldera and The Tarawera River System, Taupo Volcanic Zone, New Zealand |journal=Operations Publication 2004/03 |publisher=Environment Bay of Plenty |issn=1176-5550 |page=7 |url=http://www.envbop.govt.nz/Reports/Report-0408-TheSedimentationAndDrainageHistoryOfHaroharoCalderaAndTheTaraweraRiverSystemTaupoVolcanicZoneNewZealand.pdf |archive-url=https://web.archive.org/web/20100522220029/http://www.envbop.govt.nz/Reports/Report-0408-TheSedimentationAndDrainageHistoryOfHaroharoCalderaAndTheTaraweraRiverSystemTaupoVolcanicZoneNewZealand.pdf |url-status=dead |archive-date=2010-05-22 }}</ref> {{coord|38|05|S|176|35|E|format=dms|display=inline}}
**Lakes
**Lakes
***[[Lake Ōkataina]] {{coord|38|07|S|176|25|E|format=dms|region:NZ_type:waterbody|name=Lake Okataina}}
***[[Lake Ōkataina]] {{coord|38|07|S|176|25|E|format=dms|region:NZ_type:waterbody|name=Lake Okataina}}
Line 988: Line 1,011:
***[[Waimangu Volcanic Rift Valley]] {{coord|38|16|57|S|176|23|56|E|format=dms|type:landmark|name=Waimangu}}
***[[Waimangu Volcanic Rift Valley]] {{coord|38|16|57|S|176|23|56|E|format=dms|type:landmark|name=Waimangu}}
****[[Frying Pan Lake]] {{coord|38.283586|S|176.394866|E|format=dms|type:landmark|name=Frying Pan Lake}}
****[[Frying Pan Lake]] {{coord|38.283586|S|176.394866|E|format=dms|type:landmark|name=Frying Pan Lake}}
*'''[[:Category:Whakamaru caldera complex|Maroa Volcanic Centre]]''': The Maroa Caldera formed in the north-east corner of the Whakamaru Caldera, and the [[Whakamaru Caldera]] partially overlaps with the [[Taupō Volcano|Taupō Caldera]] on the South. The Waikato River course follows roughly the northern Maroa Caldera rim on one side. The town of [[Whakamaru]] and the artificial [[Whakamaru Power Station|Lake Whakamaru]], on the [[Waikato River]], have the same name too.<ref name="largeeruptions" /> The paired single event eruption of the Ohakuri Caldera at its north western limits with the Rotorua Caldera added later complexity after this classification was developed. Accordingly later naming, terms this the [[:Category:Whakamaru caldera complex|Whakamaru caldera complex]].
*'''[[:Category:Whakamaru caldera complex|Maroa Volcanic Centre]]''': The Maroa Caldera formed in the north-east corner of the Whakamaru Caldera, and the [[Whakamaru Caldera]] partially overlaps with the [[Taupō Volcano|Taupō Caldera]] on the South. The Waikato River course follows roughly the northern Maroa Caldera rim on one side. The town of [[Whakamaru]] and the artificial [[Whakamaru Power Station|Lake Whakamaru]], on the [[Waikato River]], have the same name too.<ref name="largeeruptions" /> The paired single event eruption of the Ohakuri Caldera at its north western limits with the Rotorua Caldera added later complexity after this classification was developed. Accordingly, later naming, terms this the [[:Category:Whakamaru caldera complex|Whakamaru caldera complex]].
**[[Ohakuri Caldera]] {{coord|-38.378|176.019|format=dms|display=inline}}
**[[Ohakuri Caldera]] {{coord|-38.378|176.019|format=dms|display=inline}}
**[[Maroa Caldera]], size: 16 x 25&nbsp;km {{coord|38.42|S|176.08|E|format=dms|type:mountain|name=Maroa Caldera}}<ref name="largeeruptions" />
**[[Maroa Caldera]], size: 16 x 25&nbsp;km {{coord|38.42|S|176.08|E|format=dms|type:mountain|name=Maroa Caldera}}<ref name="largeeruptions" />
Line 1,015: Line 1,038:
**[[Pihanga]] {{coord|39|02|28.75|S|175|46|7|E|format=dms|region:NZ_type:mountain_source:GNS-enwiki|name=Pihanga}}
**[[Pihanga]] {{coord|39|02|28.75|S|175|46|7|E|format=dms|region:NZ_type:mountain_source:GNS-enwiki|name=Pihanga}}
**[[Mount Tongariro]] and Tongariro volcanic complex {{coord|39|8|S|175|39|E|format=dms|type:mountain|name=Mount Tongariro}}
**[[Mount Tongariro]] and Tongariro volcanic complex {{coord|39|8|S|175|39|E|format=dms|type:mountain|name=Mount Tongariro}}
***[[Mount Ngāuruhoe]], a main Tongariro vent {{coord|39|9|24.6|S|175|37|55.8|E|format=dms|type:mountain_region:NZ|name=Mount Ngauruhoe}}
***[[Mount Ngauruhoe]], a main Tongariro vent {{coord|39|9|24.6|S|175|37|55.8|E|format=dms|type:mountain_region:NZ|name=Mount Ngauruhoe}}
***[[Tama Lakes|Tama crater lakes]], main Tongariro vents
***[[Tama Lakes|Tama crater lakes]], main Tongariro vents
****Upper Tama {{coord|-39.1854|175.6223|format=dms|region:NZ-WKO_type:waterbody|name=Upper Tama}}
****Upper Tama {{coord|-39.1854|175.6223|format=dms|region:NZ-WKO_type:waterbody|name=Upper Tama}}
Line 1,026: Line 1,049:
**Geothermal fields
**Geothermal fields
***Ketetahi Springs {{coord|-39.107477|175.647665|format=dms|display=inline}}
***Ketetahi Springs {{coord|-39.107477|175.647665|format=dms|display=inline}}
*'''[[Mangakino caldera complex|Mangakino Volcanic Centre]]''': The Mangakino Volcanic Center is the westernmost extinct rhyolitic caldera volcano in the Taupō Volcanic Zone and activity commenced at least 1.62 million years ago.<ref>{{Cite journal |doi=10.1080/00288306.1998.9514803 |last1=Krippner |first1=Stephen J. P. |last2=Briggs |first2=Roger M. |last3=Wilson |first3=Colin J. N. |authorlink3=Colin J. N. Wilson |last4=Cole |first4=James W. |year=1998 |title=Petrography and geochemistry of lithic fragments in ignimbrites from the Mangakino Volcanic Centre: implications for the composition of the subvolcanic crust in western Taupo Volcanic Zone, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=41 |pages=187–199 |issue=2 |doi-access=free }}</ref> The course of the [[Waikato River]] crosses this area, between the artificial [[Lake Ohakuri]] ({{coord|38.42273|S|176.125474|E|format=dms|region:NZ_type:waterbody|name=Lake Ohakuri}}), the town of [[Mangakino]] ({{coord|38|23|S|175|47|E|format=dms|region:NZ_type:city|name=Mangakino}}) and [[Hamilton, New Zealand|Hamilton]].
*'''[[Mangakino caldera complex|Mangakino Volcanic Centre]]''': The Mangakino Volcanic Centre is the westernmost extinct rhyolitic caldera volcano in the Taupō Volcanic Zone and activity commenced at least 1.62 million years ago.<ref>{{Cite journal |doi=10.1080/00288306.1998.9514803 |last1=Krippner |first1=Stephen J. P. |last2=Briggs |first2=Roger M. |last3=Wilson |first3=Colin J. N. |author-link3=Colin J. N. Wilson |last4=Cole |first4=James W. |year=1998 |title=Petrography and geochemistry of lithic fragments in ignimbrites from the Mangakino Volcanic Centre: implications for the composition of the subvolcanic crust in western Taupo Volcanic Zone, New Zealand |journal=New Zealand Journal of Geology and Geophysics |volume=41 |pages=187–199 |issue=2 |doi-access=free }}</ref> The course of the [[Waikato River]] crosses this area, between the artificial [[Lake Ohakuri]] ({{coord|38.42273|S|176.125474|E|format=dms|region:NZ_type:waterbody|name=Lake Ohakuri}}), the town of [[Mangakino]] ({{coord|38|23|S|175|47|E|format=dms|region:NZ_type:city|name=Mangakino}}) and [[Hamilton, New Zealand|Hamilton]].
**Artificial [[Lake Maraetai]]
**Artificial [[Lake Maraetai]]


Line 1,064: Line 1,087:
}} -->
}} -->
[[File:CratersOfTheMoon1.jpg|thumb|right|[[Craters of the Moon (geothermal site)|Craters of the Moon]] geothermal area]]
[[File:CratersOfTheMoon1.jpg|thumb|right|[[Craters of the Moon (geothermal site)|Craters of the Moon]] geothermal area]]
There is more recently a somewhat different classification:<ref name="Cole2009"/>
There is more recent, somewhat different classification, by some of the same authors, that uses the term caldera complex:<ref name="Cole2009"/>
*North part: [[:Category:Whakatane Graben|Whakatane Graben]] – Bay of Plenty
*North part: [[:Category:Whakatane Graben|Whakatane Graben]] – Bay of Plenty
*Central part:
*Central part:
Line 1,070: Line 1,093:
***[[Mangakino caldera complex]]; may be transitional between Coromandel Volcanic Zone (CVZ) and Taupō Volcanic Zone (TVZ) (1.62 – 0.91 mio. years old)
***[[Mangakino caldera complex]]; may be transitional between Coromandel Volcanic Zone (CVZ) and Taupō Volcanic Zone (TVZ) (1.62 – 0.91 mio. years old)
***[[Kapenga caldera]]; lies between the [[Maroa caldera]] and the [[Rotorua caldera]], it is completely buried under more recent tephra (circa 700,000 years old)
***[[Kapenga caldera]]; lies between the [[Maroa caldera]] and the [[Rotorua caldera]], it is completely buried under more recent tephra (circa 700,000 years old)
****[[Okareka Embayment]], lies inside the northern end of the Kapenga caldera, but is more usually regarded as part of the recently active [[:Category:Okataina Volcanic Centre|Okataina caldera complex]]<ref name="Plenty" />
****[[Okareka Embayment]], lies inside the northern end of the Kapenga caldera, but is now usually regarded as part of the recently active [[Ōkataina Caldera|Okataina caldera complex]]<ref name="Plenty" />
***[[Rotorua caldera|Rotorua single event caldera]]; Mamaku Ignimbrite (circa 225,000 years old)
***[[Rotorua caldera|Rotorua single event caldera]]; Mamaku Ignimbrite (circa 225,000 years old)
**Main fault zone:
**Main fault zone:
***[[:Category:Okataina Volcanic Centre|Ōkataina caldera complex]]
***[[Ōkataina Caldera|Ōkataina caldera complex]]
****[[Haroharo Caldera|Haroharo caldera complex]]
****[[Haroharo Caldera|Haroharo caldera complex]]
*****[[Mount Tarawera|Tarawera volcanic complex]]
****[[Mount Tarawera|Tarawera volcanic complex]]
***[[:Category:Whakamaru caldera complex|Whakamaru caldera complex]]
***[[:Category:Whakamaru caldera complex|Whakamaru caldera complex]]
****[[Maroa caldera]]
****[[Maroa caldera]]
Line 1,113: Line 1,136:
**{{cite book |last1=Hiess |first1=J |last2=Cole |first2=JW |last3=Spinks |first3=KD |year=2007 |title=High-Alumina Basalts of the Taupo Volcanic Zone, New Zealand: Influence of the Crust and Crustal Structure |page=36 |url=http://ir.canterbury.ac.nz/bitstream/10092/3172/1/12605971_Hiess%20%202007%20final.pdf |ref=Part of a BSc Project by Hiess, J. (University of Canterbury) }} Map modified from: {{Cite journal |last1=Spinks |first1=Karl D |last2=Acocella |first2=Valerio |last3=Cole |first3=Jim W |last4=Bassett |first4=Kari N |date=2005-06-15 |title=Structural control of volcanism and caldera development in the transtensional Taupo Volcanic Zone, New Zealand |journal=Journal of Volcanology and Geothermal Research |volume=144 |issue=1–4 |pages=7–22 |doi=10.1016/j.jvolgeores.2004.11.014 |bibcode = 2005JVGR..144....7S }}
**{{cite book |last1=Hiess |first1=J |last2=Cole |first2=JW |last3=Spinks |first3=KD |year=2007 |title=High-Alumina Basalts of the Taupo Volcanic Zone, New Zealand: Influence of the Crust and Crustal Structure |page=36 |url=http://ir.canterbury.ac.nz/bitstream/10092/3172/1/12605971_Hiess%20%202007%20final.pdf |ref=Part of a BSc Project by Hiess, J. (University of Canterbury) }} Map modified from: {{Cite journal |last1=Spinks |first1=Karl D |last2=Acocella |first2=Valerio |last3=Cole |first3=Jim W |last4=Bassett |first4=Kari N |date=2005-06-15 |title=Structural control of volcanism and caldera development in the transtensional Taupo Volcanic Zone, New Zealand |journal=Journal of Volcanology and Geothermal Research |volume=144 |issue=1–4 |pages=7–22 |doi=10.1016/j.jvolgeores.2004.11.014 |bibcode = 2005JVGR..144....7S }}
**[http://www.gsnz.org.nz/file_downloads/fieldtrip/MP123B_FT2.pdf Geological Society of New Zealand & New Zealand Geophysical Society - Fieldtrip 2]
**[http://www.gsnz.org.nz/file_downloads/fieldtrip/MP123B_FT2.pdf Geological Society of New Zealand & New Zealand Geophysical Society - Fieldtrip 2]
** {{Cite book |last1=Houghton |first1 =Bruce F. |author-link=Bruce Houghton |year=2007 |url=http://www2.hawaii.edu/~bhoughto/NZ_Field_Guide_Spring07.pdf |title=Field Guide - Taupo Volcanic Zone }}
** {{Cite book |last1=Houghton |first1 =Bruce F. |author-link=Bruce Houghton |year=2007 |url=http://www2.hawaii.edu/~bhoughto/NZ_Field_Guide_Spring07.pdf |title=Field Guide Taupo Volcanic Zone }}
**[http://volcano.oregonstate.edu/volcanoes/volc_images/australia/new_zealand/new_zealand.html New Zealand, Taupō and Coromandel volcanic zones]
**[http://volcano.oregonstate.edu/volcanoes/volc_images/australia/new_zealand/new_zealand.html New Zealand, Taupō and Coromandel volcanic zones]
**{{Cite journal |last1=Newhall |first1=Christopher G. |last2=Dzurisin |first2=Daniel |author-link=Christopher G. Newhall |year=1988 |title=Historical unrest at large calderas of the world |journal=USGS Bulletin |volume=1855 |page=1108 |url=https://pubs.er.usgs.gov/usgspubs/b/b1855 }}
**{{Cite journal |last1=Newhall |first1=Christopher G. |last2=Dzurisin |first2=Daniel |author-link=Christopher G. Newhall |year=1988 |title=Historical unrest at large calderas of the world |journal=USGS Bulletin |volume=1855 |page=1108 |url=https://pubs.er.usgs.gov/usgspubs/b/b1855 }}
**[http://www.maoriland.govt.nz/STATS/Geotherm.htm The Taupō Volcanic Zone with Māori Freehold Land (1995) - showing geothermal fields]
**[http://www.maoriland.govt.nz/STATS/Geotherm.htm The Taupō Volcanic Zone with Māori Freehold Land (1995) showing geothermal fields]


{{Authority control}}
{{Authority control}}

Latest revision as of 21:44, 26 November 2024

Taupō Volcanic Zone
Volcano and historic lake/caldera locations in the Taupō Volcanic Zone. The distance between the town of Rotorua and the town of Taupō is 80 km. (White Island is not shown.)
Volcano and historic lake/caldera locations in the Taupō Volcanic Zone. The distance between the town of Rotorua and the town of Taupō is 80 km. (White Island is not shown.)
Taupō Volcanic Zone is located in New Zealand
Taupō Volcanic Zone
Taupō Volcanic Zone
Location of Taupō Volcanic Zone in New Zealand
Taupō Volcanic Zone is located in North Island
Taupō Volcanic Zone
Taupō Volcanic Zone
Taupō Volcanic Zone (North Island)
Coordinates: 38°40′00″S 176°01′00″E / 38.66667°S 176.01667°E / -38.66667; 176.01667
LocationNorth Island
AgeMiocene - Holocene
Formed byVolcanic action
Geologysee Taupō Rift
Highest elevation2,797 m (9,177 ft)

The Taupō Volcanic Zone (TVZ) is a volcanic area in the North Island of New Zealand. It has been active for at least the past two million years and is still highly active.

Mount Ruapehu marks its south-western end and the zone runs north-eastward through the Taupō and Rotorua areas and offshore into the Bay of Plenty. It is part of a larger Central Volcanic Region that extends to the Coromandel Peninsula and has been active for four million years. The zone is contained within the tectonic intra-arc continental Taupō Rift and this rift volcanic zone is widening unevenly east–west, with the greatest rate of widening at the Bay of Plenty coast, the least at Mount Ruapehu and a rate of about 8 mm (0.31 in) per year at Taupō. The zone is named after Lake Taupō, the flooded caldera of the largest volcano in the zone, the Taupō Volcano and contains a large central volcanic plateau as well as other landforms.

Activity

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Mount Ngauruhoe

There are numerous volcanic vents and geothermal fields in the zone, with Mount Ruapehu, Mount Ngauruhoe and Whakaari / White Island erupting most frequently. Whakaari has been in continuous activity since 1826 if you count such as steaming fumaroles, but the same applies to say the Okataina volcanic centre.[1] The Taupō Volcanic Zone has produced in the last 350,000 years over 3,900 cubic kilometres (940 cu mi) material, more than anywhere else on Earth, from over 300 silicic eruptions, with 12 of these eruptions being caldera-forming.[2] Detailed stratigraphy in the zone is only available from the Ōkataina Rotoiti eruption but including this event, the zone has been more productive than any other rhyolite predominant volcanic area over the last 50,000 odd years at 12.8 km3 (3.1 cu mi) per thousand years.[3]: 230–232  Comparison of large events in the Taupō volcanic zone over the last 1.6 million years at 3.8 km3 (0.91 cu mi) per thousand years with Yellowstone Caldera's 2.1 million year productivity at 3.0 km3 (0.72 cu mi) per thousand years favours Taupo.[3]: 225  Both the Taupō Volcano and the Ōkataina Caldera have had multiple eruptions in the last 25,000 years. The zone's largest eruption since the arrival of Europeans was that of Mount Tarawera (within the Ōkataina Caldera) in 1886, which killed over 100 people. Early Māori would also have been affected by the much larger Kaharoa eruption from Tarawera around 1315 CE.[4][5]

The last major eruption from Lake Taupō, the Hatepe eruption, occurred in 232 CE.[6] It is believed to have first emptied the lake, then followed that feat with a pyroclastic flow that covered about 20,000 km2 (7,700 sq mi) of land with volcanic ash. A total of 120 km3 (29 cu mi) of material expressed as dense-rock equivalent (DRE) is believed to have been ejected, and over 30 km3 (7.2 cu mi) of material is estimated to have been ejected in just a few minutes. The date of this activity was previously thought to be 186 AD as the ash expulsion was thought to be sufficiently large to turn the sky red over Rome and China (as documented in Hou Han Shu), but this has since been disproven.[6]

Whakaari / White Island

Whakaari / White Island had a major, edifice failure collapse of its volcano dated to 946 BCE ± 52 years. It has been suggested that this was the cause of the tsunami tens of metres tall that went up to 7 kilometres (4.3 mi) inland in the Bay of Plenty at about this time. Although significant tsunami's can be associated with volcanic eruptions, it is unknown if the cause was a relatively small eruption of Whakaari or another cause such as a large local earthquake[7]

Taupō erupted an estimated 1,170 km3 (280 cu mi) of DRE material in its Oruanui eruption 25,580 years ago.[8] This was Earth's most recent eruption reaching VEI-8, the highest level on the Volcanic Explosivity Index.

The Rotorua caldera has been dormant longer, with its main eruption occurring about 225,000 years ago, although lava dome extrusion has occurred within the last 25,000 years.[9][10]

Extent and geological context

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Lady Knox Geyser, Waiotapu geothermal area

The Taupō volcanic zone is approximately 350 kilometres (217 mi) long by 50 kilometres (31 mi) wide. Mount Ruapehu marks its southwestern end, while Whakaari / White Island is considered its northeastern limit.[11]

It forms a southern portion of the active Lau-Havre-Taupō back-arc basin, which lies behind the Kermadec-Tonga Subduction Zone.[12][13] Mayor Island and Mount Taranaki are recently active back arc volcanoes on the New Zealand extension of this arc. Mayor Island / Tūhua is the northern-most shield volcano adjacent to the New Zealand coast, and is believed to have been active in the last 1000 years.[14] It is formed from rhyolite magma.[15] It has a quite complex eruptive history but only with one definite significant Plinian eruption.[14] Mount Taranaki is an andesite cone and the most recent of four Taranaki volcanoes about 140 km (87 mi) west of the Taupō Volcanic Zone.[16]

Associated with the Taupō volcanic zone, intra-arc extension is expressed as normal faulting within a zone known as the Taupō Rift.[17] Volcanic activity continues to the north-northeast, along the line of the Taupō Volcanic Zone, through several undersea volcanoes in the South Kermadec Ridge Seamounts, then shifts eastward to the parallel volcanic arc of the Kermadec Islands and Tonga. Although the back-arc basin continues to propagate to the south-west, with the South Wanganui Basin forming an initial back-arc basin, volcanic activity has not yet begun in this region.[18]

South of Kaikōura the plate boundary changes to a transform boundary with oblique continental collision uplifting the Southern Alps in the South Island. A subduction zone reappears south-west of Fiordland, at the south-western corner of the South Island, although here the subduction is in the opposite direction. Solander Island / Hautere is an extinct volcano associated with this subduction zone, and the only one that protrudes above the sea.

Scientific study

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Tectonics

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In the North Island rifting associated with plate tectonics has defined a Central Volcanic Region, that has been active for four million years and this extends westward from the Taupō volcanic zone through the western Bay of Plenty to the eastern side of the Coromandel Peninsula.[19] The dominant rifting axis associated with the Central Volcanic Region has moved with time, from the back-arc associated Hauraki Rift to the intra-arc Taupō Rift. As there is presently no absolute consensus with regard to the cause of the Taupō Rift's extension or its exceptional current volcanic productivity, some of the discussion on this page has been simplified, rather than all possible models being presented.

Recent scientific work indicates that the Earth's crust below the Taupō Volcanic Zone may be as little as 16 kilometres thick. A film of magma 50 kilometres (30 mi) wide and 160 kilometres (100 mi) long lies 10 kilometres under the surface.[20][21] The geological record indicates that some of the volcanoes in the area erupt infrequently but have large, violent and destructive eruptions when they do. Technically the zone is in the continental intraarc Taupō Rift, which is a continuation of oceanic plate structures associated with oblique Australian and Pacific Plate convergence in the Hikurangi subduction zone. At Taupō the rift volcanic zone is widening east–west at the rate of about 8 mm (0.31 in)/year, while at Mount Ruapehu it is only 2–4 mm (0.079–0.157 in)/year and this increases at the north eastern end at the Bay of Plenty coast to 10–15 mm (0.39–0.59 in)/year.[22] The rift has had three active stages of faulting in the last 2 million years with the modern Taupō rift evolving in the last 25,000 years after the massive Oruanui eruption and now being within two essentially inactive rift systems. These are the surrounding limits of the young Taupō Rift between 25,000 and 350,000 years and old Taupō Rift system whose northern boundary is now located well to the north of the other two being created before 350,000 years ago.[22]

The Tauranga Volcanic Centre which was active between 2.95 to 1.9 million years ago, and was previously classified as part of the Central Volcanic Region,[19] appears now to be in a tectonic continuum with the Taupō Volcanic Zone. Recent ocean floor tephra studies off the east coast of the North Island have shown an abrupt compositional change in these, from about 4.5 million years ago, that has been suggested to distinguish Coromandel Volcanic Zone activity from that of the Taupō Volcanic Zone.[23] Further the distinctive Waiteariki ignimbrite that erupted 2.1 million years ago in a supereruption, presumably from the gravity anomaly defined Omanawa Caldera,[24] is within the postulated borders of the old Taupō Rift.[25]

Faults

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The multiple intra-rift faults are some of the most active in the country and some have the potential to create over magnitude 7 events. The fault structures are perhaps most well characterised related to the Ruapehu and Tongariro grabens. The recent deposits from major eruptions and lake features mean many potentially significant faults are uncharacterised, either completely (for example the 6.5 MW 1987 Edgecumbe earthquake resulted in the mapping of the Edgecumbe fault for the first time) or frequency of events and their likely magnitude are not understood. It can not be assumed that just because the rate of expansion of the rift is greatest near the coast that this is where most significant tectonic earthquakes in terms of human risk will be. The Waihi Fault Zone south of Lake Taupō and associated with the Tongariro graben has a particular risk of inducing massive landslips which has caused significant loss of life and appears to be more active than many other faults in the zone.

Volcanism

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In 1886, Mount Tarawera produced New Zealand's largest historic eruption since European colonisation

The north (Whakatane Graben – Bay of Plenty) part of the zone is predominantly formed from andesitic magma[26][27] and represented by the continuously active Whakaari / White Island andesitedacite stratovolcano. Although Strombolian activity has occurred the explosive eruptions are typically phreatic or phreatomagmatic.[28] The active emergent summit tops the larger, 16 kilometres (9.9 mi) × 18 kilometres (11 mi), submarine volcano with a total volume of 78 km3 (19 cu mi).[29][30][31][32]

The central part of the zone is composed of eight caldera centres the oldest of which is the Mangakino caldera which was active more than a million years ago (1.62–0.91 Ma).[26] This produced ignimbrite that 170 km (110 mi) away in Auckland is up to 9 m (30 ft) thick.[33] Other than the now buried Kapenga caldera there are five caldera centres, Rotorua, Ohakuri, Reporoa, Ōkataina and Taupō. These have resulted from massive infrequent eruptions of gaseous very viscous rhyolite magma which is rich in silicon, potassium, and sodium and created the ignimbrite sheets of the North Island Volcanic Plateau. The detailed composition suggests subduction erosion might play a predominant role in producing this rhyolite,[34]: abstract  as later assimilation and fractional crystallization of primary basalt magma, is difficult to model to explain the composition and volumes erupted.[35] This central zone has had the largest number of very large silicic caldera-forming eruptions recently on earth as mentioned earlier.[36][3]

During a period of less than 100,000 years commencing with the massive Whakamaru eruption about 335,000 years ago of greater than 2,000 km3 (480 cu mi) dense-rock equivalent of material, just to the north of the present Lake Taupō, over 4,000 km3 (960 cu mi) total was erupted. These eruptions essentially defined the limits of the present central volcanic plateau, although its current central landscape is mainly a product of later smaller events over the last 200,000 years than the Whakamaru eruption. The other volcanic plateau defining eruptions were to the west, the 150 km3 (36 cu mi) Matahina eruption of about 280,000 years ago, the mainly tephra 50 km3 (12 cu mi) Chimp (Chimpanzee) eruption between 320 and 275 ka, the central 50 km3 (12 cu mi) Pokai eruption of about 275 ka, and the paired Mamaku to the north and east central Ohakuri eruptions of about 240,000 years ago that together produced more than 245 km3 (59 cu mi) dense-rock equivalent of material.[36] The southern Taupō Volcano Oruanui eruption about 25,600 years ago produced 530 km3 (130 cu mi) dense-rock equivalent of material and its recent Hatepe eruption of 232 CE ± 10 years had 120 km3 (29 cu mi) dense-rock equivalent.[6] Since the Whakamaru eruption the central part of the zone has dominated, so that when the whole zone is considered there has been about 3,000 km3 (720 cu mi) of rhyolite, 300 km3 (72 cu mi) of andesite, 20 km3 (4.8 cu mi) of dacite and 5 km3 (1.2 cu mi) of basalt erupted.[3]: 228, 231 

Less gaseous rhyolite magma dome building effusive eruptions have built features such as the Horomatangi Reefs or Motutaiko Island in Lake Taupō or the lava dome of Mount Tarawera. This later as part of the Ōkataina caldera complex is the highest risk volcanic field in New Zealand to man.[37] Mount Tauhara adjacent to Lake Taupō is actually a dacitic dome [38] and so intermediate in composition between andesite and rhyolite but still more viscous than basalt which is rarely found in the zone.[39]

The southern part of the zone contain classic volcanic cone structure formed from andesite magma in effusive eruptions that cool to form dark grey lava if gas-poor or scoria if gas-rich of this part of the zone. Mount Ruapehu, the tallest mountain in the North Island, is a 150 km3 (36 cu mi) andesite cone surrounded by a 150 km3 (36 cu mi) ring-plain.[40] This ring plain is formed from numerous volcanic deposits created by slope failure, eruptions, or lahars. Northwest of Ruapehu is Hauhungatahi, the oldest recorded volcano in the south of the plateau,[40] with to the north the two prominent volcanic mountains in the Tongariro volcanic centre being Tongariro and Ngauruhoe which are part of a single composite stratovolcano.

Risks

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Southwest side of Mount Tarawera, Mount Edgecumbe on the background.

The most likely risk is earthquake associated with multiple active faults,[41] such as within the Taupō Fault Belt, but many faults will be uncharacterised as was the case with the 1987 Edgecumbe earthquake.[42] Earthquakes can be associated with landslides and inland or coastal tsunami that can result in great loss of life and both have happened on the Waihi Fault Zone.[43] The relative low grade volcanic activity of the andesite volcanoes at each end of the zone has resulted in recorded history in both direct loss of life and disrupted transport and tourism. The only high grade eruption in recorded history was atypically basaltic from Mount Tarawera and although very destructive is not likely to be a perfect model for the more typical and often larger rhyolitic events associated with the Taupō Volcano and the Ōkataina Caldera.[44] As mentioned earlier the Ōkataina caldera complex is the highest risk volcanic field risk in New Zealand to man[37] and the recent frequency of rhyolitic events there is not reassuring, along with the timescale of likely warning of such an event.[44] These eruptions are associated with tephra production that results in deep ash fall over wide areas (e.g. the Whakatane eruption of ~ 5500 years ago had 5 mm (0.20 in) ashfall 900 km (560 mi) away on the Chatham Islands) `[45] pyroclastic flows and surges, which rarely have covered large areas of the North Island in ignimbrite sheets, earthquakes, lake tsunamis, prolonged lava dome growth and associated block and ash flows with post-eruption lahars and flooding.[44]

Mount Ruapehu1886 eruption of Mount TaraweraMount TaraweraTaupō VolcanoHatepe eruptionTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoŌkataina CalderaTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoŌkataina CalderaŌkataina CalderaTaupō VolcanoTaupō VolcanoTaupō VolcanoTaupō VolcanoMount TaraweraŌkataina CalderaMount TaraweraMount TaraweraŌkareka EmbaymentOruanui eruptionTaupō Volcano

Volcanoes, lakes and geothermal fields

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Map
Map of selected volcanic features as rectangular symbols for the Taupō Volcanic Zone. Volcanoes classified as active are shown as red, other notable volcanoes (there are many more) are shown as orange, geothermal areas as light blue and if active hydrothermal eruptions as blue. It is possible by clicking on the map to get a full screen view that enables mouseover to show a label (often wiki-linked) for each symbol.
Map
Map of selected surface volcanic deposits centred on the Taupō Volcanic Zone, allowing wider volcanic context. Clicking on the map enlarges it, and enables panning and mouseover of volcanic deposits name/wikilink and ages before present. The key to the shading of the volcanics that are shown is rhyolite – violet, ignimbrite – lighter shades of violet, dacite – purple, basalt – brown, monogenetic basalts – dark brown, undifferentiated basalts of the Tangihua Complex in Northland Allochthon – light brown, arc basalts – deep orange brown, arc ring basalts -orange brown, andesite – red, basaltic andesite`- light red, and plutonic – gray. White shading has been used for postulated calderas (usually subsurface now).

The following Volcanic Centres belong to the modern Taupō Volcanic Zone in what proved to be an evolving classification scheme:

Satellite view of the Lake Rotorua Caldera. Mount Tarawera is in the lower right corner.
Recent major volcanic features Lake Taupō showing relationship to recent volcanic vents in red and present active geothermal systems in light blue.
Composite satellite image of Mount Ruapehu

Rotorua, Ōkataina, Maroa, Taupō, Tongariro and Mangakino.[46][47] The old zone almost certainly contains volcanoes in the Tauranga Volcanic Centre.[48]

Other important features of the TVZ include the Ngakuru and Ruapehu grabens.

Note

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Craters of the Moon geothermal area

There is more recent, somewhat different classification, by some of the same authors, that uses the term caldera complex:[26]

Panorama across Lake Taupō

See also

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References

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  1. ^ Waight, Tod E.; Troll, Valentin R.; Gamble, John A.; Price, Richard C.; Chadwick, Jane P. (2017-07-01). "Hf isotope evidence for variable slab input and crustal addition in basalts and andesites of the Taupo Volcanic Zone, New Zealand". Lithos. 284–285: 222–236. Bibcode:2017Litho.284..222W. doi:10.1016/j.lithos.2017.04.009. ISSN 0024-4937.
  2. ^ Kósik, Szabolcs; Nemeth, Karoly; Danisik, Martin; Procter, Jonathan; Schmitt, Axel; Friedrichs, Bjarne; Stewart, Robert (2021-01-19). "Shallow subaqueous to emergent intra-caldera silicic volcanism of the Motuoapa Peninsula, Taupo Volcanic Zone, New Zealand – New constraints from geologic mapping, sedimentology and zircon geochronology". Journal of Volcanology and Geothermal Research. 411: 107180. doi:10.1016/j.jvolgeores.2021.107180. S2CID 233771486.
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