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SEISMOLOGICAL INVESTIGATIONS AT THE GEYSERS GEOTHERMAL FIELD [electronic resource].

Published
Berkeley, Calif. : Lawrence Berkeley National Laboratory, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
71 pages : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Two short (4 and 6 days) recording periods at The Geysers geothermal field provided useful data on two large refraction explosions and numerous microearthquakes. The vapor-dominated reservoir appears to be characterized by regionally anomalous high P- and S-wave velocities and low attenuation, but the anomaly seems to decrease, possibly reversing, with depth. Microearthquakes occur in a diffuse pattern, with no indication of dominant throughgoing faults and an absence of activity in the main production zone. Mechanisms are generally consistent with NE-SW compression. Occurrence rates indicate a slightly high incidence of smaller magnitude shocks. It is possible that the microearthquake activity is related to an expanding steam zone. While the present anomalies appear to delineate the reservoir, it is not certain that they would have been detectable in an exploration mode, prior to large-scale exploitation of the field.
Report Numbers
E 1.99:lbl-7023
lbl-7023
Other Subject(s)
Note
Published through SciTech Connect.
12/01/1977.
"lbl-7023"
Geophysics ISSN 0016-8033; GPYSA7 FT
Majer, E. L.; McEvilly, T.V.
Earth Sciences Division
Funding Information
DE-AC02-05CH11231
View MARC record | catkey: 14357325