Henry's Fork Caldera: Difference between revisions
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Tidied up and change to eruption of hotspot rather than super volcano, because even though Yellowstone qualifies as a super volcano, Mesa Falls doesn't qualify as a super eruption. Tags: Mobile edit Mobile web edit |
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[[Image:Island Park Caldera NASA.jpg|thumb|Henry's Fork Caldera is the circular structure in the center of this image, with left part of [[Island Park Caldera]]]] |
[[Image:Island Park Caldera NASA.jpg|thumb|Henry's Fork Caldera is the circular structure in the center of this image, with left part of [[Island Park Caldera]]]] |
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The '''Henry's Fork Caldera''' in eastern [[Idaho]] is a [[caldera]] located an area known as [[Island Park, Idaho|Island Park]], west of [[Yellowstone National Park]]. The caldera was formed by |
The '''Henry's Fork Caldera''' in eastern [[Idaho]] is a [[caldera]] located an area known as [[Island Park, Idaho|Island Park]], west of [[Yellowstone National Park]]. The caldera was formed by an [[eruption]] 1.3 million years ago of the [[Yellowstone hotspot]], that had a volume of {{convert|280|km3|abbr=on}}, this is the source of the [[Mesa Falls Tuff]]. |
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The Henry's Fork Caldera is nested inside of the [[Island Park Caldera]] and the calderas share a rim on the western side. The earlier Island Park Caldera is much larger and more oval and extends well into Yellowstone Park.<ref>Christopher Newhall and Daniel Dzurisin, 1988, [http://pubs.er.usgs.gov/usgspubs/b/b1855 Historical Unrest at Large Calderas of the World], U.S. Geological Survey Bulletin 1855</ref> Although much smaller than the Island Park Caldera, the Henry's Fork Caldera is still sizeable at {{convert|18|mi}} long and {{convert|23|mi}} wide and its curved rim is plainly visible from many locations in the Island Park area. Of the many calderas formed by the [[Yellowstone hotspot]], including the later [[Yellowstone Caldera]], the Henry's Fork Caldera is the only one that is currently clearly visible.<ref>this qualitive statement is easily verified by reviewing the Yellowstone area in Google Earth</ref> It is one of a succession of supervolcanoes and calderas that formed the [[Snake River Plain]]. |
The Henry's Fork Caldera is nested inside of the [[Island Park Caldera]] and the calderas share a rim on the western side. The earlier Island Park Caldera is much larger and more oval and extends well into Yellowstone Park.<ref>Christopher Newhall and Daniel Dzurisin, 1988, [http://pubs.er.usgs.gov/usgspubs/b/b1855 Historical Unrest at Large Calderas of the World], U.S. Geological Survey Bulletin 1855</ref> Although much smaller than the Island Park Caldera, the Henry's Fork Caldera is still sizeable at {{convert|18|mi}} long and {{convert|23|mi}} wide and its curved rim is plainly visible from many locations in the Island Park area. Of the many calderas formed by the [[Yellowstone hotspot]], including the later [[Yellowstone Caldera]], the Henry's Fork Caldera is the only one that is currently clearly visible.<ref>this qualitive statement is easily verified by reviewing the Yellowstone area in Google Earth</ref> It is one of a succession of supervolcanoes and calderas that formed the [[Snake River Plain]]. |
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Revision as of 07:57, 8 June 2015
| Henry's Fork Caldera | |
|---|---|
 Diagram of Henry's Fork and Island Park Caldera | |
| Highest point | |
| Elevation | 2,805 m (9,203 ft) |
| Geography | |
 | |
| Location | Fremont County, Idaho, United States |
| Geology | |
| Mountain type | Caldera |
| Last eruption | 1.3 myr |
The Henry's Fork Caldera in eastern Idaho is a caldera located an area known as Island Park, west of Yellowstone National Park. The caldera was formed by an eruption 1.3 million years ago of the Yellowstone hotspot, that had a volume of 280 km3 (67 cu mi), this is the source of the Mesa Falls Tuff.
The Henry's Fork Caldera is nested inside of the Island Park Caldera and the calderas share a rim on the western side. The earlier Island Park Caldera is much larger and more oval and extends well into Yellowstone Park.[1] Although much smaller than the Island Park Caldera, the Henry's Fork Caldera is still sizeable at 18 miles (29 km) long and 23 miles (37 km) wide and its curved rim is plainly visible from many locations in the Island Park area. Of the many calderas formed by the Yellowstone hotspot, including the later Yellowstone Caldera, the Henry's Fork Caldera is the only one that is currently clearly visible.[2] It is one of a succession of supervolcanoes and calderas that formed the Snake River Plain.
The Henrys Fork of the Snake River flows through the Henry's Fork Caldera and drops out at Upper and Lower Mesa Falls. The caldera is bounded by the Ashton Hill on the south, Big Bend Ridge and Bishop Mountain on the west, by Thurmon Ridge on the North and by Black Mountain and the Madison Plateau on the east.
The Henry's Fork caldera is in an area called Island Park, known for its beautiful forests, large springs, clear streams, waterfalls, lakes, ponds, marshes, wildlife, and fishing. Harriman State Park is situated in the caldera. The peaks of the Teton Range in adjacent Wyoming are visible to the southeast. Snowmobiling, fishing, and Nordic skiing, and wildlife viewing are popular activities in the area.
References
- ^ Christopher Newhall and Daniel Dzurisin, 1988, Historical Unrest at Large Calderas of the World, U.S. Geological Survey Bulletin 1855
- ^ this qualitive statement is easily verified by reviewing the Yellowstone area in Google Earth