Petra, watch out for cause and effect- if people read your email first they may get head aches, upset stomachs, or vertigo because they are worried about an impending quake. OK, I guess I'm supposed to be using my fault experience here. I don't find the Aptos earthquake very unusual or alarming, but I don't live in California. The earthquakes mentioned by Don in Hollister, near San Juan Baustista, have probably been happening for at least a few hundred thousans years, fairly continuously, because this area is near the south end of the creeping part of the San Andreas fault (is that the Calaveras fault that creeps in Hollister? I visited Hollister about 12 years ago on a field trip).

If you mean that the long-term slip rate on the Zayente Vergeles fault is 0.1 mm/yr (I'd have to check), this is not a very hazardous fault. If it were to slip, say, 1 m in an earthquake, it would only repeat this every 10,000 years. A much more active fault in the area is the coastal San Gregorio fault. There seems to be some consensus that this now slips at 6 or 8 mm/year. Oh, I forgot. The California offshore fault maps are very incomplete so who knows if the offshore faults are even shown on the maps you are looking at. As usual, I am not double-checking the exact numbers I'm using, but I'm pretty close on the San Gregorio.
By the way, in case you think I'm dissing the sensitives: yes, there is magnetite in human brains. Yes, I hear ear noises and am curious what they are (but have never noticed a correlation with earthquakes.) Chris