The pair of quakes that hit near Yorba Linda last night and Wednesday morning were detected by a new earthquake warning system that was showcased at Cal Tech.
A 4.4-magnitude earthquake struck in Orange County Tuesday night and was felt by residents across Los Angeles and San Bernardino counties.
The 4.1 earthquake that struck Wednesday night occurred near the Whittier fault, which has produced major quakes in the past, leading some to ask if it was a precursor to something bigger.
An earthquake with a preliminary magnitude of 4.1 struck in Orange County Wednesday night.
An earthquake with a preliminary magnitude of 4.0 jolted the Channel Islands region on Tuesday.
An earthquake with a preliminary magnitude of 3.8 jolted the east-northeast area near Barstow on Sunday.
A small quake rattled a section of southern Kern county early Monday morning, the U.S. Geological Survey reported.
The future of San Rafael Elementary School may be on very shaky ground.
Will it take another disaster like the 1994 Northridge earthquake to strengthen financing for a statewide earthquake warning system?
Many Inland Empire residents were shaken out of bed Saturday morning by a magnitude 3.8 earthquake that struck near Devore and sent several aftershocks rumbling through Southern California.
Four large earthquakes struck around the Pacific Rim Wednesday with one setting a record, as the most powerful strike-slip quake ever recorded.
Airport officials said there were no reports of any flight delays after a magnitude-7.6 earthquake that struck near Acapulco on Tuesday.
Parents at Warren High School in Downey were shocked by what we discovered about their two-story concrete classroom building — just one of thousands that state experts said could be putting children at risk in the next big earthquake.
A 3.5 magnitude earthquake struck early Tuesday morning in a remote region near the Mojave Desert.
The government has been testing an early alert system since February that was developed by the California Institute of Technology and UC Berkeley.