United States Geological Survey
Scientists studying earthquake faults in the mountains west of Lake Tahoe say new high-resolution imaging technology has uncovered more substantial seismic hazards than previously believed.
The quake was centered a mile north of El Cerrito, four miles north of Berkeley. Phone-in reports indicate that the quake was felt across much of the East Bay as well as the North Bay and San Francisco, according the the United States Geological Survey website.
A 2.3-magnitude earthquake struck just outside Berkeley late Wednesday night, followed by a 1.8-magnitude aftershock Thursday morning, according to the U.S. Geological Survey.