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Earthquake-induced liquefaction features in Holocene sediments provide evidence of strong prehistoric shaking, magnitude mb 6.2 to 6.7, in the Wabash Valley bordering Indiana and Illinois. The source of the one or more earthquakes responsible was almost certainly in or near the Wabash Valley. The largest event is interpreted to have occurred between 7500 and 1500 years ago on the basis of archeological, pedological, and stratigraphic relations.
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Evidence of strong earthquake shaking in the lower wabash valley from prehistoric liquefaction features