57 Los Angeles County Firefighters are bringing 6 search dogs, cameras, sonar and heavy cutting equipment.
The U.S. Geological Survey says the magnitude 3.5 quake struck six minutes after midnight and was centered near San Ramon.
A small earthquake has shaken the Coalinga area of the Central Valley but there are no reports of damage.
Three dozen members of Congress from California, Oregon and Washington are urging full funding of a West Coast earthquake early warning system.
A new report says California faces a greater than 99 percent chance of being rocked by a strong earthquake in the next 30 years.
A 6.9-magnitude earthquake off the east coast of Japan has prompted a tsunami advisory for the same area hit by a devastating tsunami in 2011, NHK Worldwide reports.
The U.S. Geological Survey is reporting a magnitude 3.1 earthquake has struck the San Francisco Bay area.
A moderate earthquake with a preliminary magnitude of 5.7 has struck off the coast of Northern California.
A light earthquake has shaken a Central California region southeast of Monterey Bay.
Two earthquakes have struck north of Los Angeles, shaking parts of Ventura and Los Angeles counties, but fire officials say no significant damage took place.
No reports of damage or injury from the tremor, estimated to have been centered near the town of San Juan Bautista. It could be felt in Silicon Valley and Monterey.
Authorities say a magnitude 3.1 earthquake rattled Napa County wine country in California, but no injuries or property damage was immediately reported.