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Clear Lake Volcanic Field

Lake County, California geography stubsLandforms of Lake County, CaliforniaMaars of CaliforniaNatural history of the California Coast RangesQuaternary California
Quaternary volcanoesUse mdy dates from November 2020Volcanic fields of California
The Geysers geologic map
The Geysers geologic map

The Clear Lake Volcanic Field is a volcanic field beside Clear Lake in California's northern Coast Ranges. The site of late-Pliocene to early Holocene activity, the volcanic field consists of lava domes, cinder cones, and maars with eruptive products varying from basalt to rhyolite. The site's threat level is ranked "High" at #33 in the top volcanic threats in the United States according to "2018 Update to the U.S. Geological Survey National Volcanic Threat Assessment". The last eruption being about 11,000 years ago. Cobb Mountain and Mount Konocti are the two highest peaks in the volcanic field, at 4,724 feet (1,440 m) and 4,285 feet (1,306 m) respectively. The field's magma chamber also powers a geothermal field called The Geysers, which hosts the largest complex of geothermal power plants in the world. These can generate approximately 2000 megawatts, enough to power two cities the size of San Francisco.The Clear Lake volcanics are thought to have been the heat source for the hot springs and hydrothermal activity that formed the mercury ores at the Sulphur Bank Mine, and the gold ore at the McLaughlin Mine.

Excerpt from the Wikipedia article Clear Lake Volcanic Field (License: CC BY-SA 3.0, Authors, Images).

Clear Lake Volcanic Field
Broadview Drive,

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N 38.97 ° E -122.77 °
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Broadview Drive
95443
California, United States
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The Geysers geologic map
The Geysers geologic map
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