Off the coast of Oregon - shallow too, only 10km deep:
Eight quakes ranging from 3.2 to 5.4 Mag.
This is right where the Cascadia Subduction Zone is located and is the origin of the 9 Mag quakes that happen every 300 to 500 years. Last one was January 26th, 1700. There is a wonderful book that covers this event: The orphan tsunami of 1700—Japanese clues to a parent earthquake in North America. Part detective story, part history and lots of science. Available for free download.
When the big one happens again, we are screwed. Camano Island actually fares really well because we are behind Whidby Island so the tsunami will only be a couple of feet high. The coast will be toast.
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