News

Many of California's young volcanoes pose a threat to people and property.

A hazards assessment for Lassen Volcanic Center, California, is now available for download from the USGS Publications Warehouse.

In mid-October, U.S. Geological Survey volcanologists and geophysicists plan to conduct the first comprehensive, high-resolution airborne magnetic...

An energetic earthquake swarm (largest event magnitude 5.5) is ongoing in the Brawley Seismic Zone south of the Salton Sea in Southern California.

Summer is the time when most CalVO scientists get out into the field to conduct geologic and ground-based monitoring investigations of our regional...

On May 22, 1915 an explosive volcanic eruption occurred at Lassen Peak, California.

Welcome to the new USGS California Volcano Observatory website! The USGS Volcano Science Center recently restructured observatory operations to...

During FY11, Long Valley Observatory's jurisdiction was expanded to encompass all California volcanoes and one volcanic center in Nevada. The...

A new design for the USGS Volcano Science Center (VSC) web pages is now open for internal viewing. This site has not been fully developed yet, and...

The U.S. Geological Survey and Lassen Volcanic National Park are pleased to announce a special public presentation by USGS scientists to unveil, the...