Public Interest
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California Volcano Information
| Volcanoes: More than 500 volcanic vents have been identified in the State of California. At least 76 of these vents have erupted, some repeatedly, during the last 10,000 years. Sooner or later, volcanoes in California will erupt again, and they could have serious impacts on your health and safety. -- Miller, C. Dan, 1989, Potential Hazards from Future Volcanic Eruptions in California: USGS Bulletin 1847, 17p. | |||
| What to do if a volcano erupts | What to do during ashfall | What to do during mudflows | What to do during floods |
Volcanic Activity
 Photo USGS Mt. St. Helens, Washington |
Cascade Range Volcanoes and Volcanics - Current Updates U.S. Geological Survey, Vancouver, Washington provides current status, advisories, recent observations, and potential ash hazards for Cascade Range volcanoes including: Mount Baker, Glacier Peak, Mount Rainier, and Mount Adams in Washington State; Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake, in Oregon; and Medicine Lake, Mount Shasta, and Lassen Peak in northern California. The Cascade Range of the Pacific Northwest has more than a dozen potentially active volcanoes. Cascades volcanoes tend to erupt explosively, and on average two eruptions occur per century--the most recent were at Mount St. Helens, Washington (1980-86), and Lassen Peak, California (1914-17). --USGS/Living With Volcanic Risk in the Cascades |
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 USGS Photograph taken by Lyn Topinka, 1984 |
Mt Shasta Cam Updates every 20 min. Web cam courtesy of MacShasta.com |
| Mount Shasta Elevation: 14,162 feet Location: Northern California, USA |
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 May 22, 1915 eruption -Photo: R.E.Stinson |
Mount St. Helen's Cam Updates every 5 min. WebCam courtesy of: USDA Forest Service |
Mount St. Helen's Photo to the left: The May 22, 1915, explosive eruption of Lassen Peak, California, blasted rock fragments and pumice high into the air and rained fine volcanic ash as far away as Winnemucca, Nevada, 200 miles to the east. In this photograph taken from near the town of Red Bluff, 40 miles west of the volcano, the huge column of volcanic ash and gas produced by the eruption rises to a height of more than 30,000 feet. (Photograph taken by R.E. Stinson; courtesy of the National Park Service.) USGS |
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Active and Potentially Active Volcanoes in California
Medicine Lake, Mount Shasta, Lassen Peak, Clear Lake, Long Valley (including Inyo, Mono, Mammoth), Coso Peak
Information available from: USGS Cascades Volcano Observatory
Research Links
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