Two separate earthquakes were reported near the San Francisco Bay Area on Tuesday, according to the U.S. Geological Survey.

A light, 4.1-magnitude earthquake struck in Southern California on Sunday ... prompt U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake that ...

A USGS map shows where in California 2.5 magnitude (or greater) earthquakes were recorded in the last seven days—the San Andreas Fault is represented as a thick red line. A USGS map shows where ...