wrote in (along with a number of other concerned folks): "There was a 5.2 Earthquake in Gilroy, CA, 70 miles south of San Francisco. The epicenter was 4.7 miles below surface. It lasted for about 10 seconds, and it did seem like a long time. Everything shook for a while, and it was a little scary. No reports of damage yet. Hope everyone is ok."
I've got a report from my sisters father-in-law in gilroy
(the epicenter) and he barely noticed it. Nate Oostendorp
noted that "My stereo shook a little" in Walnut Creek. The SF Gate
story on the quake notes that there are some phones out in some small parts of San Jose. The usgs has an event monitoring page
if you are interested.