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Active and Potentially Active Volcanoes in the United States
-- From: Wright and Pierson, 1992,
Living with Volcanoes, The U.S. Geological Survey's Volcano Hazards Program: U.S. Geological Survey Circular 1073, 57p |
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|---|---|---|---|---|
| Volcano | Eruption type(s) | Number of eruptions in past 200 years | Latest activity (in years before present or year(s) A.D.) | Remarks |
| Washington State | ||||
| Mount Adams | Lava, ash | 0 | More than 3,500 years ago | Debris flows are the most recent events |
| Mount Baker | Ash, lava | 1 | 1870 | Increased heat output and minor melting of summit glacier in 1975; some debris flows not related to eruption. History of extensive pyroclastic flows |
| Glacier Peak | Ash | More than 1? | Before 1800 | |
| Mount Rainier | Ash, lava | 1? | 1882 | History of massive debris avalanches and debris flows. Occasional very shallow seismicity |
| Mount St. Helens | Ash, dome, lava | 2-3 | 1980 to present | Continuing intermittent volcanic activity |
| Oregon | ||||
| Crater Lake | Lava, ash, dome | 0 | 4,000 years ago | Largest known eruption from Cascade Range volcano. Catastrophic, caldera-forming eruption 7,000 years ago; post-caldera lava and domes |
| Mount Hood | Ash, dome | 2? | 1865 | Occasional seismic swarms |
| Mount Jefferson | Ash, lava | 0 | More than 50,000 years ago | Debris flows in 1934, 1955; young basaltic flows in nearby area |
| Newberry Crater | Ash, lava | 0 | 600 | Latest eruption was obsidian flow |
| Three Sisters | Ash, lava | 0 | 950? | Debris flows in this century |
| California | ||||
| Clear Lake | Lava, ash | 0 | Not known | Geothermal energy and long-period (volcanic) seismicity suggest "active" status |
| Coso Peak, California | Lava, ash, dome | 0 | About 40,000 years ago | Geothermal energy production and seismic activity suggest "active" status |
| Lassen Peak | Ash, dome | 1 | 1914-1917 | Lateral blast occurred in last eruption |
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Long Valley Caldera, California
(Inyo-Mono-Mammoth) |
Ash, dome, ashflow | 3? | About 1400 | Youngest activity represented by nearly simultaneous eruptions of rhyolite at several of the Inyo craters; currently restless, shown by seismicity and ground deformation |
| Medicine Lake | Ash, lava | 0 | 1065 | Latest eruption formed Glass Mountain |
| Mount Shasta | Ash, dome | 1 | 1786? | Debris flows in this century |
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The Continental Interior
Arizona, Idaho, Montana, New Mexico, and Wyoming |
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| Bandera Field (McCarty's Flow), New Mexico | Lava | 1 | About 1,000 | Most voluminous lava within past 1,000 years |
| Craters of the Moon, Idaho | Lava | About 1 | 2,100 years ago | Youngest activity in the Snake River Plain |
| San Francisco Field, Arizona | Lava | 2 | 1065-1180 | Sunset Crater; disrupted Anasazi settlements |
| Yellowstone Caldera, Wyoming, Montana, and Idaho | Ashflow | 0 | 70,000 years ago | Numerous hydrothermal explosions, geysers, geothermal activity; currently restless, shown by seismicity and ground deformation |
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