IMPERIAL COUNTY, CA - Thursday morning, a 4.1 magnitude quake was detected close to Holtville, according to the U.S.

MENDOCINO COUNTY, CA - A 4.4 magnitude quake was registered near Willits at midday on Tuesday, according to the U.S.

The USGS reported that, over the past several days, a sequence of at least five earthquakes shook California, with magnitudes ...

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

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