Cascadia, If that fault goes, it will most likely last in duration for a full 5 minutes.
And it is really humped up an ready to go.
They now think that it will just about level places like Seattle.
FEMA tells any survivors west of I-5 to walk east, expects nothing man-made to be in one piece. Last quake about 9.0 based on landscape damage uncovered from ~1699 shake. Mystery tsunami recorded in historical archives from that period in Japan.
When the quake stops, will have 10-15 minutes to get above +150 foot altitude along coast.