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

An earthquake with a revised magnitude of 4.3 struck northern Sonoma County Saturday morning, followed by two smaller aftershocks. The first quake was recorded at 9:22 a.m., about 15 miles ...

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

San Ramon, Calif., has been rattled by dozens of small earthquakes in recent months. Even in a region used to regular shaking ...

Levi's Stadium is built 'like a shock absorber.' ...

San Ramon, Calif., has been rattled by dozens of small earthquakes in recent months. Even in a region used to regular shaking, it’s been a lot.

An ongoing string of more than a dozen earthquakes in less than 90 minutes early Monday ended what had been some recent calm from recent weeks of shaking ground in the region, according to the U.S.

"The good news about earthquake swarms is they don’t appear to lead to bigger quakes. Not a single one has ever been associated with a major earthquake." ...

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 ...