Scientists link a magnitude 6.5 earthquake that shook Humboldt Bay, California, 71 years ago to the "locked" Cascadia ...

An earthquake with a preliminary magnitude of 3.1 struck in Colusa County on Wednesday, the U.S. Geological Survey said.

What lies beneath Fickle Hill in northern California? Maybe the answer to an earthquake mystery that has puzzled ...

CWU Geological Sciences Professor Walter Szeliga received some well-deserved attention for his unique approach to detecting ...

The mega tsunami could wash away major cities like Seattle and Portand in minutes, while great swathes of US costal land ...

A series of more than 100 earthquakes has hit Northern California, shaking up the Geysers geothermal steam field in Sonoma ...

More than 100 small earthquakes have been recorded near the Geysers geothermal field in Northern California since just after midnight Thursday, according to the U.S. Geological Survey.

Two earthquakes struck different parts of Northern California early Thursday morning, according to the U.S. Geological Survey. The first, a 4.0-magnitude quake, hit at 5:48 a.m. about 5 miles ...

A series of moderate to minor earthquakes struck near the geologically active area in Northern California known as The Geysers south of Clear Lake Thursday morning.

Two earthquakes struck different parts of Northern California early Thursday morning, according to the U.S. Geological Survey ...