http://news.yahoo.com/earthquake-rattles-northern-california-usgs-134940899.html

OAKLAND, California (Reuters) - A magnitude 4.0 earthquake shook the San Francisco Bay area on Monday, the U.S. Geological Survey reported.
The quake, which was initially reported at a 4.3 magnitude, was centered about 15 miles northeast of San Francisco, and was at a depth of 5.5 miles, the USGS said.