| Active and Potentially Active Volcanoes in California | ||||
| Volcano | Eruption type(s) | Number of eruptions in past 200 years | Latest activity (in years before present or year(s) A.D.) | Remarks |
|---|---|---|---|---|
| Medicine Lake | Ash, lava | 0 | 1065 | Latest eruption formed Glass Mountain |
| Mount Shasta | Ash, dome | 1 | 1786? | Debris flows in this century |
| Lassen Peak | Ash, dome | 1 | 1914-1917 | Lateral blast occurred in last eruption |
| Clear Lake | Lava, ash | 0 | Not known | Geothermal energy and long-period (volcanic) seismicity suggest "active" status. |
|
Long Valley Caldera
(including 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 |
| Coso Peak | Lava, ash, dome | 0 | About 40,000 years ago | Geothermal energy production and seismic activity suggest "active" status |
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