Mike Duffy submitted this idea :
On Fri, 10 Jun 2016 11:26:50 -0700, Eagle wrote:

Still waiting for "the big one"...

Mag 9+ occur about every 400 years. The last one was about 400 years ago.

https://en.wikipedia.org/wiki/Cascadia_subduction_zone

From the article:

In 2009, some geologists predicted a 10% to 14% probability that the
Cascadia Subduction Zone will produce an event of magnitude 9.0 or higher
in the next 50 years. In 2010, studies suggested that the risk could be
as high as 37% for earthquakes of magnitude 8.0 or higher.

Geologists and civil engineers have broadly determined that the Pacific
Northwest region is not well prepared for such a colossal earthquake.

Don't forget that the San Andreas fault runs right through LA and the
Inland Valley, which is My part of So. Cal. That is what will devistate
Los Angeles, Riverside and San Bernardino counties. I am in the Inland
Empire, which is less than 100 miles from the fault.