Since Thursday, at least 131 earthquakes have been recorded — as small as magnitude 0.2 and as big as magnitude 4 — in the Geysers geothermal steam field in Sonoma and Lake counties.

A preliminary-magnitude 3.6 magnitude earthquake on Friday morning rattled the Mountain Center area south of Idyllwild in Riverside County, the U.S. Geological Survey said. There were no reports of ...

A 3.6-magnitude earthquake struck in Riverside County on Friday morning. The epicenter was in the Valle Vista community near ...

Southern California was rocked by a trio of earthquakes in the past 12 hours. Two of the quakes struck in 10 minutes, with ...

An earthquake with a preliminary magnitude of 3.6 rattled the San Jacinto Valley on Friday morning. According to the U.S. Geological Survey, the quake struck at 9:43 a.m. The epicenter was about 6 ...