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The Geysers is an active geothermal area within the Clear Lake volcanic field in Northern California. The earthquake activity in the Geysers area is quite variable over time, in terms of the number of events and their magnitude range.

This excerpt is taken from the Berkeley Seismological Laboratory 1992 Bulletin:

There were no earthquakes (ML >= 2.5) observed in the area of the geothermal field between 1949 and 1975. Starting in 1976 earthquakes were observed in the geothermal field and the rate steadily increased to a rate of at least 12 earthquake (ML >= 2.5) per year since 1984. The maximum annual rate was 26 earthquakes (ML >= 2.5) which occurred in 1988 (this is equivalent to 40 percent of the annual rate for the entire central coast ranges).

Information from the USGS

• Clear Lake Volcanic Field

• General Interest Publication on Geysers, Fumaroles, and Hot Springs
• Geothermal Energy

The Geysers Geothermal Field

• Calpine Geothermal Visitor Center
• Unocal

Online Publications

• Subsidence at The Geysers geothermal field

Other information

• The "Old Faithful" Geyser in Calistoga, California
• Links to Other Resources in Volcanoes

Northern California Earthquake Data Center 215 McCone Hall, UC Berkeley Berkeley CA 94720-4760 www@quake.geo.berkeley.edu

Copyright 1995-2003, The Regents of the University of California.
Last modified: Wed Oct 29 08:42:07 PST 2003