The Helena Valley sits atop a variety of different sediments and rocks, making it particularly susceptible to earthquake ...

The most widespread way is through Wireless Emergency Alerts (WEA), which sends loud alerts to all cellphones. If an ...

A massive Pacific Northwest earthquake could trigger a devastating second quake on California's San Andreas Fault, a new ...

At San Fernando Middle School, students were evacuated from classrooms and went to the “safety” of their playing field.

A major earthquake hasn't struck any of California's biggest cities in more than three decades, but the "Big One" is a matter ...

Millions of residents, students and office workers in Los Angeles and Orange counties and across the state took part in the 17th annual Great California ShakeOut drill Thursday, following instructions ...

Nearly a million San Diego County residents will participate Thursday in this year's Great California ShakeOut, the statewide ...

A small earthquake jolted the East Bay Thursday morning, as people across the Bay Area were preparing for the annual Great ...

A total of 980,458 participants were registered in San Diego to stop everything for a minute to "drop, cover and hold on" at ...

Millions of residents, students and office workers in Los Angeles and Orange counties and across the state will "drop, cover ...

The one-minute drill was developed to teach people what to do when a large temblor strikes. If you have the MyShake app, your ...