The earth and geologic time. Earth materials -- Geologic time -- Plate tectonics -- Southern California through geologic time. Overview of the geologic history of Southern California -- Proterozoic ...

A 3.2-magnitude earthquake shook parts of Southern California, the U.S. Geological Survey reported. The about 10-mile deep ...

LOS ANGELES COUNTY, CA - Sunday morning, a 2.1 magnitude quake was recorded close to Los Angeles, according to the U.S. Geological Survey.

A major earthquake hasn't struck any of California's biggest cities in more than three decades, but the "Big One" is a matter ...

Earthquakes have shaken both coasts of the United States since the afternoon of Tuesday, Aug. 5 — rattling areas near the country’s two largest metro regions. In Southern California, a quake struck ...

A magnitude-4.4 earthquake struck at 9:32 a.m. around 3.5 miles north of Fontana, according to the U.S. Geological Survey. The earthquake could be felt in at least Palm Springs and Idyllwild. In south ...

SAN BERNARDINO COUNTY, CA - A 3.5 magnitude quake was registered close to Big Bear City Sunday morning, according to the U.S.

Research in the U.S. Southwest could expand lifesaving efforts for hazards that follow wildfires across the globe.

The first earthquake happened at around 11:15 p.m. Saturday, with several more occurring into Sunday morning, the USGS said.