News

On October 6, 2013 the California Office of Emergency Services (CalOES) published its 2013 State of California Multi-Hazard Mitigation Plan complete...

A magnitude 3.8 earthquake occurred on October 21, 2013 at 10:04 PDT 18 km (11 miles) SE of the town of Mammoth Lakes in eastern California.

Since 1990, high levels of carbon dioxide (CO2) in the soil have killed trees within about a 75-acre area adjacent to Horseshoe Lake on the south side...

In the late afternoon of 17 June 2013 a flurry of earthquakes started in the Long Valley Caldera east of the town of Mammoth Lakes, California (in an...

February 2013 marked the first year of successful volcano monitoring and preparing for possible volcanic eruption for the California Volcano...

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...