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California Volcano Observatory's mission
As a part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada.

Lassen Hazards Assessment Published
October 01, 2012
A hazards assessment for Lassen Volcanic Center, California, is now available for download from the USGS Publications Warehouse. The Lassen region of the southernmost Cascade Range is an active volcanic area and will erupt in the future. At least 70 eruptions have occurred in the past 100,000 years, including 3 in the past 1,000 years, most recently in 1915. Although the annual probability of an eruption is small, the consequences of some types of eruptions could be severe. The hazards assessment and report presents a discussion of volcanic and other geologic hazards in the Lassen area and delineates hazards zones for different types of volcanic activity. Visit the Pubs Warehouse to download the report.

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High to Very High Threat Potential ¹
Clear Lake Volcanic Field
Lassen Volcanic Center
Long Valley Caldera
Medicine Lake
Mono-Inyo Chain
Mount Shasta
Salton Buttes
Moderate Threat Potential ¹
Coso Volcanic Field
Soda Lakes (NV)
Ubehebe Craters
Low to Very Low Threat Potential ¹
Brushy Butte
Eagle Lake Volcanic Field
Golden Trout Creek Volcanic Field
Lavic Lake Volcanic Field
Silver Lake Volcanic Field
Tumble Buttes
Twin Buttes

^{1. View the threat rankings of US Volcanoes.}