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

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

According to the U.S. Geological Survey, a preliminary 2.4 magnitude quake struck near Petrolia Wednesday morning.

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

The Diablo Canyon nuclear plant is in the midst of a relicensing process that, if successful, will keep it running for ...

A stretch of unusually hot weather combined with exceptionally dry vegetation will elevate the risk of wildfire.

Most people in San Diego County don’t worry about earthquakes until the earth beneath them starts shaking. Just ask folks out in Julian who were jolted by a quake back in April. Up until Oct. 1, ...

Californians can now apply to the California Earthquake Authority's Brace + Bolt grant program, which gives money to homeowners, and now landlords, to strengthen homes against earthquake damage.

In March, the observatory said it had measured “significantly elevated volcanic gas emissions" from Mount Spurr and said ...

A dangerous heat wave is about to take hold across the southwest. We're tracking the dramatic rise in temperatures from Arizona to Southern California. We'll show you how local officials are preparing ...