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Fact Sheet 2014–3120

The California Volcano Observatory—Monitoring the State’s Restless Volcanoes

By Wendy K. Stovall, Mae Marcaida, and Margaret T. Mangan

Thumbnail of and link to report PDF (2.8 MB)Abstract

Volcanic eruptions happen in the State of California about as frequently as the largest earthquakes on the San Andreas Fault Zone. At least 10 eruptions have taken place in California in the past 1,000 years—most recently at Lassen Peak in Lassen Volcanic National Park (1914 to 1917) in the northern part of the State—and future volcanic eruptions are inevitable. The U.S. Geological Survey California Volcano Observatory monitors the State's potentially hazardous volcanoes.

First posted December 8, 2014

For additional information, contact:
California Volcano Observatory
U.S. Geological Survey
345 Middlefield Road
Menlo Park, CA 94025

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Suggested citation:

Stovall, W.K., Marcaida, M., and Mangan, M.T., 2014, The California Volcano Observatory—Monitoring the State's restless volcanoes: U.S. Geological Survey Fact Sheet 2014–3120, 4 p.,

ISSN 2327-6916 (print)

ISSN 2327-6932 (online)


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