I just noticed a 3.7 in the east bay of SF that appears right on the Calaveras. This whole area has been an area of interest to me and I've studied it on my own quite a bit over the past 20 years. This segment of the Calaveras has been locked, extending from this area all the way up to Walnut Creek. I have personally never seen any quake on the fault in this area (but I could be wrong.) The area north of this quake either east or west of the fault has been very active the past 20 years with thousands of 1s and dozens of 3s and 4s, but, never anything on the Calaveras itself, again from Walnut Creek down through Sunol where this quake is. Bears watching closely to see if anything else comes of it.

Also as of now no aftershocks. Again any quake 3+ in this region usually gets a fairly robust aftershock patter (like 1 magnitude 2 and maybe 10 1s over a week but usually starting within minutes of the main quake).