SONOMA COUNTY, CA - A preliminary 2.3 magnitude quake was detected near The Geysers Wednesday morning, according to the U.S. Geological Survey.

MENDOCINO COUNTY, CA - According to the U.S. Geological Survey, a preliminary 2.3 magnitude quake shook near Redwood Valley Tuesday morning.

The quake struck shortly before 11 a.m.

Earthquakes usually strike without warning. But sometimes they come in clusters — dozens or even hundreds of small quakes concentrated in one area over days or weeks. Geologists call these clusters ...

An earthquake typically sets off ruptures that ripple out from its underground origins. But on rare occasions, seismologists have observed quakes that reverse course, further shaking up areas that ...

According to reporting based on U.S. Geological Survey data, a magnitude 4.9 earthquake struck Riverside County at 5:56 p.m. local time, centered roughly seven miles from Indio. The quake was shallow, ...

A 3.5 magnitude earthquake hit northwest of West Valley City and many people across the Wasatch Front felt it. ABC4 acquired video footage of the earthquake.

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

Over the past few days, the Coachella Valley has experienced more than 20 earthquakes, causing concern among some residents. The magnitude 4.9 quake reported about 12 miles north of Indio the evening ...

Illinois urges earthquake preparedness after a 3.8 magnitude quake in Montgomery County; learn safety tips during Earthquake ...

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