Hi John. You sly old fox. You just might be in for the ride of your life. Take Care…Don in creepy town

Western Washington's two major earthquakes this century had minimal impact north of Seattle. But new evidence suggests that in the previous 1,100 years an area between Everett and Marysville experienced at least three earthquakes of at least moderate intensity that produced liquefaction.

The events also produced at least one tsunami and one sudden ground level change, Jody Bourgeois, a University of Washington associate professor of geological sciences, reported today (May 4) in Seattle at the Seismological Society of America annual meeting.

Bourgeois and Sam Johnson of the U.S. Geological Survey in Denver collected data from the Snohomish River delta indicating one of the liquefaction events happened about the same time that land levels dropped as much as 2 feet in places and a tsunami rolled through Possession Sound between Everett and Whidbey Island.

The land-level change was determined from changes in fossil vegetation, and a thin layer of sand in the delta's sedimentary layers is evidence of a tsunami. Radiocarbon dating indicates those events happened between A.D. 800 and 950, and the scientists say they are linked to a large earthquake on the Seattle fault, 30 miles to the south.

Evidence presented to the seismological society by Brian Atwater, a UW affiliate professor of geological sciences and USGS geologist, narrows the timing for a major Seattle fault earthquake to between A.D. 900 and 930.

http://www.uwnews.org/article.asp?articleID=3257

• Washington Pre-Historic Quakes