Seattle earthquake history?
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http://www.geophys.washington.edu/SEIS/PNSN/INFO_GENERAL/NQT/where_damage.html
And here is a complete history of earthquakes in washington state from USGS:
http://earthquake.usgs.gov/regional/states/washington/history.php
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I think the scientists looked through the mud and saw that these events occur every 300-600 years.
http://en.wikipedia.org/wiki/1700_Cascadia_earthquake
http://bulletin.geoscienceworld.org/cgi/content/abstract/115/10/1289 - apparently they occur ever 570-590 years on average over the last 6,700 years. It turns out they have dropped the land. not raised it.
Discovery, Science or History Channel.
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Seattle and Portland are relatively close to the Western US's subduction zone (one plate sliding under another), though not nearly so as Southern California, which actually straddles the plate junction.
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