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Volcano Hazards Program

Find U.S. Volcano

There are about 170 potentially active volcanoes in the U.S. The mission of the USGS Volcano Hazards Program is to enhance public safety and minimize social and economic disruption from volcanic unrest and eruption through our National Volcano Early Warning System. We deliver forecasts, warnings, and information about volcano hazards based on a scientific understanding of volcanic behavior.

News

Volcano Watch — Distant versus local earthquakes and tsunami response times in Hawaii

Volcano Watch — Distant versus local earthquakes and tsunami response times in Hawaii

Monitoring stations detect small magnitude earthquakes at Mount Rainier during July and August 2025

Monitoring stations detect small magnitude earthquakes at Mount Rainier during July and August 2025

In Memoriam: Wes Hildreth, 1938-2025

In Memoriam: Wes Hildreth, 1938-2025

Publications

Ice thickness regulates heat flux in permanently ice-covered lakes Ice thickness regulates heat flux in permanently ice-covered lakes

The permanently ice-covered lakes of Taylor Valley, Antarctica, are rare ecosystems where permanent ice cover and year-round vertically stable water columns provide critical redox zones for cold-adapted microorganisms. Using 30 yr of limnological data from the McMurdo Dry Valleys Long-Term Ecological Research program, we assessed the water column heat flux of four permanently ice-covered...
Authors
Hilary Dugan, Maciej Obryk, Michael Gooseff, Peter Doran, Amy Chiuchiolo, Jade Lawrence, John Priscu

New insights into gas-driven phase segregation in andesitic enclaves from Mt. Mazama (Crater Lake), USA New insights into gas-driven phase segregation in andesitic enclaves from Mt. Mazama (Crater Lake), USA

A key process in active magmatic systems is the “recharge” of deep-sourced mafic magma into cooler, more evolved, and crystal-rich shallow reservoirs; recharge may be the cause of, or response to, eruptive activity. Although compositional evidence for recharge has been extensively documented, physical models of recharge are limited, particularly processes that separate exsolving...
Authors
Julie Oppenheimer, Katharine V. Cashman, Alison Rust, Charles Bacon, Amanda Lindoo, Katherine J. Dobson
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