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.

INYO COUNTY, CA - A preliminary 2.5 magnitude quake was detected near Dixon Lane-Meadow Creek Wednesday morning, according to ...

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

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.

A 5.7-magnitude earthquake struck the Drake Sea near Puerto Williams, Chile, in the early hours of Tuesday. Alarms were ...

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

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 ...