NWNN: Research Shows Cascadia Quakes Sometimes Trigger San Andreas Fault

Here’s an article from the Northwest News Network about new scientific evidence that’s says that Cascade earthquakes have triggered San Andreas earthquakes several times over the millennia. How could disaster response be delayed and impaired if the entire west coast is impacted rather than just the north or south coast? Of course, the big question that remains to be answered is what magnitude of San Andreas quakes are triggered by Cascade earthquakes. The San Francisco metro area alone has around a million more people than the Seattle metro area. If a large CSZ quake triggered a large San Andreas fault quake, how far down the priority list would aid to outlying/coastal Washington towns fall if such a scenario were to occur?

New earthquake research to be presented by Oregon-based geologists
next week sounds like a B movie plot — a great earthquake along the
Pacific Northwest’s offshore Cascadia fault triggers another great
earthquake on the northern San Andreas Fault. In what may be a case
where life imitates art — or more precisely, where science catches up
to the fertile imaginations of Hollywood script writers — attendees at a
major earth science meeting in San Francisco will hear evidence that
this cascade of disaster happened many times over the past couple of

“I mean, Cascadia is big enough by itself,” said lead
researcher Chris Goldfinger of Oregon State University. “But if you add
in San Francisco and the North Coast, it is literally almost a grade B
movie scenario that people don’t want to think about that much.”

…Goldfinger said he found nine to eleven instances over roughly the last
3,000 years where a Cascadia earthquake seems to have triggered a San
Andreas quake. The vast majority of great Cascadia quakes during that
period have a correlation on the San Andreas Fault. He added that his
analysis of landslide traces found no evidence for the stress transfer
working in reverse — from south to north…

Click here to read the entire story at NWNN.

Marginally related:

TMIN: Mt. Rainier And The New Madrid Fault Zone Were Both Just Hit By Significant Earthquakes