Was looking up something else and ran into this. Here is the seismic design map for our area (PDF file) from the US Geological Survey. Not the worst (Seismic Design Catagory E) but just one step removed (Seismic Design Catagory D2) Seattle and areas south are solid E - an excerpt:
The coast is toast but we have some significant danger here too. Gets better once you get over the Cascade mountain passes. Downright quiet in Eastern Washington and Idaho.
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