A mysterious and highly active undersea volcano off the Pacific Coast could erupt by the end of this year, scientists say.

Researchers found that a potential powerful earthquake combined with rising sea levels could lead to a mega tsunami.

The 1980 Mount St. Helens eruption began with a steady series of earthquakes in March. By April it began spewing smoke, ...

California has seven active volcanoes, each with a unique eruption history, categorized by type and threat level. The USGS monitors these volcanoes, providing information to authorities and the ...

Over the Sierra crest — about 150 miles to the east of Manteca, Oakdale, and Turlock — is one of the world’s largest active ...

Five springs in California converge on this state park, making it a paradise for those who want to paddle through its calm ...

A NASA-Smithsonian collaboration has revealed that carbon dioxide released from rising magma makes surrounding vegetation ...

"There is a lot more work to do." Scientists make mind-blowing discovery about volcanoes that could save lives: 'Advance ...