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Cascades Volcano Observatory

Find U.S. Volcano

The U.S. Geological Survey's Cascades Volcano Observatory strives to serve the national interest by helping people to live knowledgeably and safely with volcanoes in Washington, Oregon, and Idaho. 

News

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Uptick in earthquake activity at Mount St. Helens remains within background levels (July 15, 2023-Present)

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Tonga’s Hunga eruption produced the most intense lightning ever recorded

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Mount Rainier reminds us that September is National Preparedness Month

Science

Hazards Summary for Three Sisters

Three Sisters is a potentially active volcanic center that lies close to rapidly growing communities and resort areas in Central Oregon.
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Hazards Summary for Three Sisters

Three Sisters is a potentially active volcanic center that lies close to rapidly growing communities and resort areas in Central Oregon.
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Geology and History of Glacier Peak

Glacier Peak (3214 m, 10544 ft) is a stratovolcano composed mainly of dacite, which is located about 100 km (65 mi) northeast of Seattle and 110 km (70 mi) south of the International Boundary with Canada. It lies in the rugged and scenic Glacier Peak Wilderness Area, in the Mt. Baker-Snoqualmie National Forest and rises only a few thousand feet above neighboring peaks that reach 2,700 m.
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Geology and History of Glacier Peak

Glacier Peak (3214 m, 10544 ft) is a stratovolcano composed mainly of dacite, which is located about 100 km (65 mi) northeast of Seattle and 110 km (70 mi) south of the International Boundary with Canada. It lies in the rugged and scenic Glacier Peak Wilderness Area, in the Mt. Baker-Snoqualmie National Forest and rises only a few thousand feet above neighboring peaks that reach 2,700 m.
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Lava Flow Hazards at Three Sisters

Volcanoes in the Three Sisters region have erupted a wide variety of magma types, therefore the shape, size, and impact of future lava flows could vary greatly.
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Lava Flow Hazards at Three Sisters

Volcanoes in the Three Sisters region have erupted a wide variety of magma types, therefore the shape, size, and impact of future lava flows could vary greatly.
Learn More