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[Rogerdodger]

http://www.kplu.org/...es-eerily-quiet

“If it is completely locked, it means it is increasingly storing energy and that has to be released at some point.”
The last full rip of the Cascadia Subduction Zone happened in January 1700. The exact date and destructive power was determined from buried forests along the Pacific Northwest coast and an “orphan tsunami” that washed ashore in Japan.

Geologists digging in coastal marshes and offshore canyon bottoms have also found evidence of earlier great earthquakes and tsunamis. The inferred timeline of those events gives a recurrence interval between Cascadia megaquakes of roughly every 400 to 600 years