The U.S. Geological Survey reported that a magnitude-2.9 quake struck at 5:33 a.m. about eight miles northeast of San Francisco in the city of El Cerrito. It was followed eight seconds later by a magnitude-4.0 temblor.
The shaking could be felt within a 60-mile radius, from Santa Rosa to Santa Cruz.
The California Highway Patrol, San Francisco police and El Cerrito police said they didn't receive any immediate reports of injury or damage. Bay Area commuter trains were briefly delayed after the quake to inspect the tracks.
The Associated Press contirbuted to this report.