We had a 4.7 in February in England.
It hit just before 1am
Was about 100 miles south of me, but we all felt it, only a rumble and car alarms etc going off.
We thought it was ICI Teesside going up again as happened a year or so earlier. An explosion heard 15 miles away put out windows in my home town which is at the furthest point 3 miles away from the chemical works.
Kinda scary but I was always led to beleive that tremours are a common occurance in California.