Earthquake History of the Seattle Fault on Bainbridge Island
This is a collaborative research project among investigators from the U.S. Geological Survey (Golden and Denver, Colorado; Seattle; and Menlo Park, California), Humboldt State University (Arcata, California), Shannon and Wilson, Inc. (Seattle), and the University of Washington (Seattle), made possible by cooperation and support from Port Blakely Tree Farms, L.P. (Seattle). Investigators and their affiliations are listed below.
Five backhoe trenches were recently dug across a newly discovered scarp along the Toe Jam fault, a small fault within the Seattle fault zone. Some questions that we hope to answer through study of the sediments in the trenches include: How many large earthquakes have occurred on the Seattle fault since the Puget glacier lobe retreated into Canada 16,000 years ago? How large (magnitude 6 or 7?) were the earthquakes? Did several earthquakes occur over a short span of time, or were the earthquakes spaced evenly in time over many thousands of years? When was the last large earthquake on this part of the Seattle fault?
Source: USGS-Seattle Fault wikipedia
Where's the source?
ReplyDelete