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.
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.
Young Volcanoes in WA, OR & ID
Young Volcanoes in WA, OR & ID
Very High Threat Potential 1
Crater Lake
Glacier Peak
Mount Baker
Mount Hood
Mount Rainier
Mount St. Helens
Newberry
Three Sisters
High Threat Potential 1
Mount Adams
Moderate Threat Potential 1
Mount Bachelor
Low to Very Low Threat Potential 1
Belknap
Black Butte Crater Lava Field
Blue Lake Crater
Cinnamon Butte
Craters of the Moon Volcanic Field
Davis Lake Volcanic Field
Devils Garden Lava Field
Diamond Craters Volcanic Field
Hell's Half Acre Lava Field
Indian Heaven Volcanic Field
Jordan Craters Volcanic Field
Mount Jefferson
Sand Mountain Volcanic Field
Wapi Lava Field
West Crater Volcanic Field
Cascades Volcano Monitoring
Cascades Volcano Monitoring
USGS Cascades Volcano scientists listen to and watch volcanoes using a variety of equipment. Seismometers detect earthquakes, GPS receivers detect ground motion, "sniffers" detect volcanic gas, and staff innovate new equipment to solve unique activity detection needs.
Cascades Volcano Hazards
Cascades Volcano Hazards
Volcanic activity in the Cascade Range can produce many types of volcano hazards. Tall and snow-covered mountains can be hazardous even without a change in volcanic activity.
News
Science
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.
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.