A new scientific warning has put California’s earthquake risk in sharp focus: supershear earthquakes—rare, high-speed ruptures that outpace traditional seismic waves—pose a growing threat to the state ...

A major earthquake hasn't struck any of California's biggest cities in more than three decades, but experts and officials say the so-called "Big One" is a matter of when, not if. And the risk is far ...

A minor, 3.3-magnitude earthquake struck in Southern California on Thursday, according to the United States Geological Survey ...