Three-dimensional Q (super -1) model of the Coso Hot Springs known geothermal resource area (in Coso geothermal area)

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Journal Article: Three-dimensional Q (super -1) model of the Coso Hot Springs known geothermal resource area (in Coso geothermal area)

Abstract
Observations of teleseismic P waves above geothermal systems exhibit travel time delays and anomalously high seismic attenuation, which is extremely useful in estimating the thermal regime and the potential of the system. A regional telemetered network of sixteen stations was operated by the U.S. Geological Survey in the Coso Hot Springs Known Geothermal Resources Area (KGRA) for such studies from September 1975 to October 1976. Subsequently, they deployed a portable Centipede array of 26 three-component stations near the center of the anomaly. The seismograms of 44 events recorded by the telemetered array and nine events by the Centipede array were analyzed using the reduced spectral ratio technique to determine the differential attenuation factor delta t* for the events recorded with the highest signal-to-noise ratio. The delta t* variation observed across the Coso Hot Springs KGRA were small (<0.2 s). A three-dimensional generalized linear inversion of the delta t* observations was performed using a three-layer model. A shallow zone of high attenuation exists within the upper 5 km in a region bounded by Coso Hot Springs, Devils Kitchen, and Sugarloaf Mountain probably corresponding to a shallow vapor liquid mixture or "lossy" near surface lithology. No zones of significantly high attenuation occur between 5- and 12- km depth. Between the depth of 12-20 km a thick zone of high attenuation (Q < 50) exists, offset toward the east from the surface anomaly.

Authors 
Young, C.Y.; Ward and R.W.  








Published Journal 
Journal of Geophysical Research, 5/1/1980





DOI 
Not Provided
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Citation

Young, C.Y.; Ward, R.W.  . 5/1/1980. Three-dimensional Q (super -1) model of the Coso Hot Springs known geothermal resource area (in Coso geothermal area). Journal of Geophysical Research. (!) .