AKSAR - good for you and the ShakeAlert folks in Seattle. This couldn't come at a better time, and you know why. I wish we had an operational system down in So. Cal. It's ridiculous that we don't.

I suspect that seismic-scientists-in-the-know do already have a beta version (i.e. an early version of an earthquake warning system) running in their offices in So. Cal, but it has not "gone public" yet. It's going to be a painful and ugly process when L.A. gets hit with a major shake. That's coming up very soon.

http://www.latimes.com/local/lanow/la-me-ln-earthquake-early-warning-20170502-story.html

This article is one of several discussing the EWS in development for California. Not cheap, but well worth it in the long run. As to when the next major event occurs, who can say. Pick a time ranging from 5 minutes to 500 years....