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Sandwich Fault Zone

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The Sandwich Fault Zone is a fault zone that runs northwest from Oswego to Ogle County, transecting Lee County in Northern Illinois. The fault has generally not been active, although there was a minor earthquake in 2002, and another, slightly larger one, in 2010.[1] It has a largely 400 to 600-foot vertical displacement, although parts can reach up to an 800-foot displacement, and is likely a configuration of several smaller faults, varying in both direction and displacement.[2][3]

References

  1. ^ "No injuries, damage in 3.8-magnitude earthquake". WLS-TV. February 10, 2010. Retrieved 15 March 2010.
  2. ^ Morrow, William (May 2003). "When is the next earthquake in Illinois?" (PDF). Water Resources Update – Illinois District Newsletter. US Geological Survey. p. 5. Retrieved 7 March 2010.
  3. ^ McGarry, Christopher S. (1999). "Bedrock Geology of Lee County Illinois". Illinois State Geological Survey. Retrieved 27 September 2014.

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