CONTRA COSTA COUNTY, CA - According to the U.S. Geological Survey, a 4.2 magnitude quake hit close to San Ramon Monday morning.

Earthquakes are unsettling, but a swarm of earthquakes can be downright scary, and some San Francisco residents are worried the Big One is near.

Seventy-five tremors hit San Ramon, a small California city on February 2. Here's what caused the swarm and why it isn't entirely unexpected.

A series of small earthquakes rattled the San Francisco Bay Area in an area that’s had a lot of seismic activity in recent ...

Over the last few days, the Coachella Valley has experienced more than 20 earthquakes, causing concern among some residents.

HUMBOLDT COUNTY, CA - A 4.7 magnitude quake was registered close to Petrolia Thursday morning, the U.S. Geological Survey ...

A minor earthquake struck northeast of Indio early Sunday, Feb. 1, in the same area where a stronger quake shook the Coachella Valley in mid-January.

The jolt of seismic activity Monday was among the busiest of a swarm that began nearly 3 months ago. Until the quake Friday, an earthquake swarm that began Nov. 9 around San Ramon had delivered 91 ...

Multiple reports highlight which cities in the U.S. face increased risk of earthquakes, with California topping the list.