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Attenuation structure of Coso geothermal area, California, from wave pulse widths

Huatao Wu and Jonathan M. Lees
Attenuation structure of Coso geothermal area, California, from wave pulse widths
Bulletin of the Seismological Society of America (October 1996) 86 (5): 1574-1590

Abstract

Pulse width data are used to invert for attenuation structure in the Coso geothermal area, California. The dataset consists of pulse width measurements of 838 microseismic events recorded on a seismic array of 16 downhole stations between August 1993 and March 1994. The quality factor Q correlates well with surface geology and surface heat flow observations. A broad region of low Q ( nearly equal 30 to 37) is located at 0.5 to 1.2 km in depth below Devil's Kitchen, Nicol Prospects, and Coso Hot Springs. A vertical, low Q ( nearly equal 36 in contrast with surrounding rock of 80) region is interpreted as a channel through which hydrothermal energy is transported from depth to the surface. The location of the channel is between stations S1 and S4, and its dimension is about 1 km. At the deep end of the channel, a large, broad body of low Q is also located at 3 km in depth 2 to 4 km to the southwest of Nicol Prospects and Devil's Kitchen. Since it lies at the bottom of the target region and beyond the scope of seismicity, further research is needed to constrain its extent. Numerical modeling with a pseudospectral method is also done to investigate the applicability of the inversion scheme to fractured regions. A linear relationship between pulse width broadening and travel time is upheld, and the proportional constants are estimated.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 86
Serial Issue: 5
Title: Attenuation structure of Coso geothermal area, California, from wave pulse widths
Affiliation: Yale University, New Haven, CT, United States
Pages: 1574-1590
Published: 199610
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 32
Accession Number: 1997-008923
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N36°00'00" - N36°02'60", W117°47'60" - W117°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199703
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