Actions for Seismic velocity structure and microearthquake source properties at The Geysers, California, geothermal area [electronic resource].

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Seismic velocity structure and microearthquake source properties at The Geysers, California, geothermal area [electronic resource].

Published
Berkeley, Calif. : University of California, Berkeley, 1986.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 214 : digital, PDF file
Additional Creators
University of California, Berkeley and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The method of progressive hypocenter-velocity inversion has been extended to incorporate S-wave arrival time data and to estimate S-wave velocities in addition to P-wave velocities. S-wave data to progressive inversion does not completely eliminate hypocenter-velocity tradeoffs, but they are substantially reduced. Results of a P and S-wave progressive hypocenter-velocity inversion at The Geysers show that the top of the steam reservoir is clearly defined by a large decrease of V/sub p//V/sub s/ at the condensation zone-production zone contact. The depth interval of maximum steam production coincides with minimum observed V/sub p//V/sub s/, and V/sub p//V/sub s/ increses below the shallow primary production zone suggesting that reservoir rock becomes more fluid saturated. The moment tensor inversion method was applied to three microearthquakes at The Geysers. Estimated principal stress orientations were comparable to those estimated using P-wave firstmotions as constraints. Well constrained principal stress orientations were obtained for one event for which the 17 P-first motions could not distinguish between normal-slip and strike-slip mechanisms. The moment tensor estimates of principal stress orientations were obtained using far fewer stations than required for first-motion focal mechanism solutions. The three focal mechanisms obtained here support the hypothesis that focal mechanisms are a function of depth at The Geysers. Progressive inversion as developed here and the moment tensor inversion method provide a complete approach for determining earthquake locations, P and S-wave velocity structure, and earthquake source mechanisms.
Report Numbers
E 1.99:lbl-22280
lbl-22280
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/01/1986.
"lbl-22280"
"DE87006170"
O'Connell, D.R.
Funding Information
AC03-76SF00098
View MARC record | catkey: 14381166