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Title: Double Difference Earthquake Locations at the Salton Sea Geothermal Reservoir

Abstract

The purpose of this paper is to report on processing of raw waveform data from 4547 events recorded at 12 stations between 2001 and 2005 by the Salton Sea Geothermal Field (SSGF) seismic network. We identified a central region of the network where vertically elongated distributions of hypocenters have previously been located from regional network analysis. We process the data from the local network by first autopicking first P and S arrivals; second, improving these with hand picks when necessary; then, using cross-correlation to provide very precise P and S relative arrival times. We used the HypoDD earthquake location algorithm to locate the events. We found that the originally elongated distributions of hypocenters became more tightly clustered and extend down the extent of the study volume at 10 Km. However, we found the shapes to depend on choices of location parameters. We speculate that these narrow elongated zones of seismicity may be due to stress release caused by fluid flow.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
923617
Report Number(s):
UCRL-TR-233538
TRN: US200806%%424
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ALGORITHMS; EARTHQUAKES; FLUID FLOW; HYPOCENTERS; NETWORK ANALYSIS; PROCESSING; SALTON SEA; SALTON SEA GEOTHERMAL FIELD; SEISMICITY; WAVE FORMS

Citation Formats

Boyle, K L, Hutchings, L J, Bonner, B P, Foxall, W, and Kasameyer, P W. Double Difference Earthquake Locations at the Salton Sea Geothermal Reservoir. United States: N. p., 2007. Web. doi:10.2172/923617.
Boyle, K L, Hutchings, L J, Bonner, B P, Foxall, W, & Kasameyer, P W. Double Difference Earthquake Locations at the Salton Sea Geothermal Reservoir. United States. doi:10.2172/923617.
Boyle, K L, Hutchings, L J, Bonner, B P, Foxall, W, and Kasameyer, P W. Wed . "Double Difference Earthquake Locations at the Salton Sea Geothermal Reservoir". United States. doi:10.2172/923617. https://www.osti.gov/servlets/purl/923617.
@article{osti_923617,
title = {Double Difference Earthquake Locations at the Salton Sea Geothermal Reservoir},
author = {Boyle, K L and Hutchings, L J and Bonner, B P and Foxall, W and Kasameyer, P W},
abstractNote = {The purpose of this paper is to report on processing of raw waveform data from 4547 events recorded at 12 stations between 2001 and 2005 by the Salton Sea Geothermal Field (SSGF) seismic network. We identified a central region of the network where vertically elongated distributions of hypocenters have previously been located from regional network analysis. We process the data from the local network by first autopicking first P and S arrivals; second, improving these with hand picks when necessary; then, using cross-correlation to provide very precise P and S relative arrival times. We used the HypoDD earthquake location algorithm to locate the events. We found that the originally elongated distributions of hypocenters became more tightly clustered and extend down the extent of the study volume at 10 Km. However, we found the shapes to depend on choices of location parameters. We speculate that these narrow elongated zones of seismicity may be due to stress release caused by fluid flow.},
doi = {10.2172/923617},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 08 00:00:00 EDT 2007},
month = {Wed Aug 08 00:00:00 EDT 2007}
}

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