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Small Swarm in Long Valley 17 June 2013

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...

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CalVO's Successful First Year of Operation

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

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Volcano Hazards Discussed at Joint State and Federal Meeting

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

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Lassen Hazards Assessment Published

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

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Aeromagnetic Survey of Long Valley and Mono Basin Volcanic Areas

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

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Earthquake Swarm in the Brawley Seismic Zone

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

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Summer Field Work Underway

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

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May 22 marks Lassen Peak's 97th eruption anniversary

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

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Hello CalVO

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

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California Volcano Observatory website released at AGU

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

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California volcanoes web pages soft, internal launch

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...

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A Geologic 'Event' at Lassen Volcanic National Park

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

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