A 3.4 magnitude earthquake hit the Hercules area of the East Bay around 10 a.m. this morning. But we didn't feel anything here in San Francisco, how about you? This report states that it was felt "as far north as Santa Rosa, as far east as Rancho Cordova, and as far south as Redwood City", so maybe we're just not that observant.
BART was shut down briefly as a precaution, and the Contra Costa sheriff's office said it had received no reports of damage or injuries, though a number of people called Hercules police out of the concern that an explosion had taken place.
3.4 magnitude quakes fall just under the Richter guidelines of "Often felt, but rarely causes damage." Generally, a quake must exceed 5.4 to cause even minor damage.
See all recent Bay Area quakes here.