A hidden shard of ancient crust has been detected where California’s San Andreas system collides with the Cascadia subduction zone, reshaping how I understand the tectonic engine of the West Coast.

Along the remote coast where the San Andreas Fault meets the Cascadia subduction zone, earthquakes too small for humans to feel are sketching out a hidden map of danger. By tracking these tiny tremors ...

A section of the San Andreas fault where earthquakes occur regularly may give off a distinct signal before it trembles to life, new research finds. The signal hints at the opening and closing of ...

An earthquake struck near the High Desert community of Pearblossom, and along the San Andreas Fault. The magnitude 3.3 quake struck at 10:49 p.m. on Monday, Sept. 8, four miles south of Pearblossom in ...

Remote sections along California’s massive San Andreas Fault, where large earthquakes regularly occur, may be primed to shake again any day now, according to a new study. The area around Parkfield in ...

The geometric structure of rocks where earthquakes occur could play a key role in determining their location and strength, researchers have found. A study, carried out by geologists at Brown ...

Last Monday, April 14, an earthquake caught many people’s attention in Southern California. It was centered near the town of Julian about 35 miles inland from San Diego and triggered the USGS ...