a 3.6 that is 25 miles away from Mammoth Mtn and you are calling it a seismically quiet area? First 25 miles isn't squat geologically for influences. Secondly, what time frame are we looking at? I suspect that there have been more quakes in the area than you are aware of.
I was basing my information on the USGS map showing a open area without any major fault lines crisscrossing it. I consider SF, LA, Parkfield, and El Centro areas that have significant fault lines to be major earthquake zones. We do feel earthquakes in our area, but as far as California is concerned we live in a safe zone.
If you want to following the San Andreas fault in the SJ/ SF area, take a aerial photograph, find the hospitals, then connect the hosptials by a marker. You will have almost the exact location of the San Andreas.