Upper crustal faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California

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Conference Proceedings: Upper crustal faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California

Abstract
New multifold seismic reflection data from the Coso geothermal field in the central Coso Range, eastern California, image brittle faults and other structures in a zone of localized crustal extension between two major strike-slip faults. The Coso Wash fault, a Quaternary-active normal fault that is a locus of surface geothermal activity, is well-imaged as a moderately dipping reflector that terminates against a reflector or reflective zone at approximately 4 km depth. The 4 km reflective zone can be traced laterally beneath the geothermal field, and based on the correlation of the reflector with the base of seismicity it may the brittle-ductile transition. Southeast-dipping listric reflectors that we correlate with mapped faults flatten above or terminate against the 4 km reflector. Production in the Coso field primarily occurs in the hanging walls of the listric faults. The seismic images also reveal a prominent high-amplitude reflector at 6 km depth directly beneath the geothermal field. The reflector exhibits slight antiformal geometry and appears to be restricted to the northern part of the producing zone. The 6 km reflector is interpreted to be a pocket of magmatic brine or partial melt, and is probably at or near the top of a magma chamber imaged by recent teleseismic studies.

Authors 
Unruh, J.; Monastero, F.; Pullammanappallil, S.; Honjas and W.  








Published 
Transactions - Geothermal Resources Council, 1/1/2002





DOI 
Not Provided
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Citation

Unruh, J.; Monastero, F.; Pullammanappallil, S.; Honjas, W.  . 1/1/2002. Upper crustal faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California. Proceedings of (!) ; (!) : Transactions - Geothermal Resources Council.


Related Geothermal Exploration Activities
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Areas (1)
  1. Coso Geothermal Area
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