Clear Lake Volcanic Field

Clear Lake Volcanic Field
Elevation	4,724 ft (1,440 m) [1]
Location
Location	Lake County, California, USA
Range	North Coast Ranges
Coordinates	38°58′N 122°46′W / 38.97°N 122.77°W / 38.97; -122.77[2]
Topo map	USGS Kelseyville
Geology
Type	lava domes, cinder cones, maars within volcanic field[2]
Age of rock	less than 2.1 million years[3]
Last eruption	Holocene[2]

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.^[2] Cobb Mountain and Mount Konocti are the two highest peaks in the volcanic field, at 4,724 feet (1,440 m)^[1] and 4,285 feet (1,306 m)^[4] 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.^[5] These can generate approximately 2000 megawatts, enough to power two cities the size of San Francisco.^[3]

References

1. ^ ^{a b} U.S. Geological Survey Geographic Names Information System: Cobb Mountain. Retrieved 2008-08-19.
2. ^ ^{a b c d} "Clear Lake". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=1203-10-. Retrieved 2008-08-19. 
3. ^ ^{a b} Wood, Charles A.; Jűrgen Kienle (1993). Volcanoes of North America. Cambridge University Press. pp. 226–229. ISBN 0-512-43811-X. 
4. ^ U.S. Geological Survey Geographic Names Information System: Mount Konocti. Retrieved 2008-08-19.
5. ^ W. Jacquelyne Kious; Robert I. Tilling (1996-02) (PDF). This Dynamic Earth: The Story of Plate Tectonics: USGS General Interest Publication. 1.13. United States Geological Survey. pp. 98. http://pubs.usgs.gov/gip/dynamic/dynamic.pdf. Retrieved 2009-01-06. 

External links

• Clear Lake Volcanic Field, California, Cascades Volcano Observatory, United States Geological Service
• The Geysers, Calpine