I'm in the San Francisco Bay Area, living around 1000 feet from the Rogers Creek Fault, probable home of California's next big one.
I turned the "alerts" off years ago, because they donlt actually work. How many years ago? Glad you asked ... over four decades. When I was at SAIL we had a seismograph wired to send an alarm (sonalerts in all participants living quarters, ~100 participants) at the first sign of fairly low-level P-waves. After a year or so, not a single one of us managed to get out of the house before the S-waves got there.
The project was dropped as useless.