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Monitoring California's active volcanoes—seismic unrest is on our radar

Earthquakes rocked residents near the towns of Mammoth Lakes and Big Pine in eastern California this month, including a magnitude 3.74 and 3.44 on...

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CalVO Fact Sheet Published En Español

We are pleased to announce the Spanish translation of our recently published CalVO Fact Sheet The California Volcano Observatory – Monitoring the...

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New insight into faults in the Long Valley Caldera reduces the predicted earthquake shaking intensity

The shaking hazard posed by earthquakes on range-front faults near the town of Mammoth Lakes, CA is lower than previously estimated.

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Field-trip guide for Lassen Volcanic Center published

USGS geologists Patrick Muffler and Michael Clynne published a new geologic field-trip guide for areas in and around Lassen Volcanic National Park in...

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3D Images of Magma Below Mono Craters Area

USGS CalVO scientists have developed a new 3D conceptual model of the magma system below Mono Lake and Mono Craters in eastern California to give...

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3D Images of Magma Below Mono Craters Area

A new conceptual model of the magma system below Mono Lake and Mono Craters in eastern California gives scientists a more detailed understanding of...

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Binational Exchange provides opportunity for Chile and US officials to work together on volcano hazard risk reduction.

Scientists, civil authorities, and emergency managers from Chile and the U.S. met in California to discuss the challenges of effective volcanic hazard...

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Bi-national Exchange provides opportunity for Chile and US officials to work together on volcano hazard risk reduction

Scientists, civil authorities, and emergency managers from Chile and the U.S. met in California to discuss the challenges of effective volcanic hazard...

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Lassen Peak Eruption 100th Anniversary - May, 2015

2015 marks the centennial of the May 22, 1915 explosive eruption of Lassen Peak.

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Mount Shasta earthquake series poses no immediate hazard

Since February 19, 2015 an ongoing series of small earthquakes has been occurring approximately 5 miles southeast of the summit of Mount Shasta, near...

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Earthquake Swarm near Lassen Volcanic Center

CalVO is tracking an earthquake swarm that began on November 9 located at the Tehama County-Plumas County border within Lassen National Forest.

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Published overview of low-level unrest in the Long Valley Caldera, eastern California

A cataclysmic eruption of 600 km3 of rhyolite magma (Bishop Tuff) about 760,000 years ago resulted in the collapse of the partially evacuated magma...

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