Hi Martin. Just out of curiosity I did a search for past quakes at that location. I used a 5 mile radius so as not include quakes near the San Andreas. Not much activity has occurred there in the past and nothing outstanding, but then again there is always the first time. Take Care…Don in creepy town.

CDMG 1972 02 26 100858.80 36.03 -121.59 10 2.03 MDGS
CDMG 1972 04 25 142533 36.08 -121.62 8 2.18 MDGS
CDMG 1973 08 05 200123.50 36.05 -121.61 9 2.08 MDGS
PDE 1988 12 04 105716.40 36.11 -121.55 5 2.80 MLBRK
PDE 1991 01 31 003906.80 36.04 -121.55 10 3.50 MLBRK
PDE 1991 02 04 163836.20 36.03 -121.56 13 4.70 MLBRK
PDE 1992 01 04 073507.70 36.05 -121.57 11 2.50 MLBRK
PDE 1995 02 20 002504.29 36.04 -121.57 5 2.80 MLGS