the last, great earthquake struck the Cascadia Subduction Zone. Researchers are confident in the exact date since the resultant tsunami was recorded in written records in Japan, and it correlates directly with oral histories of native Americans.
The geologic record also contains evidence of this event in the form of stratigraphic deposits found in the tidal inlets and estuaries of the Oregon and Washington coast. By studying a vertical succession of such deposits the recurrence interval for great quakes has been determined to range between 300 and 900 years along the northwest coast (with an average of 590 years.)
Tick tock. Tick tock.
Monday, January 26, 2009
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