Especially take note of the statement in the report:
"Geodetic measurements of present-day deformation geologic evidence of abrupt episodic coastal subsidence in the past suggests that this strain is periodically released in large earthquakes."

Meaning the whole coast is subject to collapse.

The undersea redwoods off the coast of the Pacific northwest are evidence of this. From what I recall, no one witnessed the quake in the US, but a large Tsunami was reported in Japan during the same period.

Billion