A swarm of a half-dozen earthquakes reaching up to magnitude 2.9 rattled San Ramon in California near San Francisco, the U.S.

SAN RAMON — An unsettling pattern of the ground shaking often near this city continued Friday morning, when three minor ...

Earthquake swarms are clusters of small quakes caused by complex fault systems and underground stress, and scientists say ...

These things turn on and turn off,” said David Schwartz, a geologist and scientist emeritus with the US Geological Survey.

The three temblors struck four minutes apart, according to the U.S. Geological Survey. The strongest was magnitude 3.0.

A preliminary 3.2 magnitude earthquake rattled San Ramon on New Year’s Day, according to the United States Geological Survey.

For more than a month, the San Francisco Bay Area has been subjected to a seemingly ceaseless stampede of earthquakes — the latest in a series of seismic swarms that have rattled windows and raised fe ...

Dozens of small earthquakes have shaken the San Francisco Bay Area over the last month, rattling nerves and raising fears that more seismic events may be on the horizon. The clusters of earthquakes — ...

San Ramon, a picturesque town in California's Bay Area, has been facing an unsettling reality as it endures a series of earthquake swarms. Recent seismic activity ha ...

A swarm of at least a dozen earthquakes as strong as magnitude 3.9 rattled San Ramon near San Francisco, the U.S. Geological Survey reports. The other quakes in the Saturday swarm ranged from ...

Clusters of small quakes can be unsettling to Californians, but scientists say they rarely signal that a major quake is ...