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Southern California Hypocenter Relocation with Waveform Cross-Correlation, Part 2: Results Using Source-Specific Station Terms and Cluster Analysis

Shearer, Peter and Hauksson, Egill and Lin, Guoqing (2005) Southern California Hypocenter Relocation with Waveform Cross-Correlation, Part 2: Results Using Source-Specific Station Terms and Cluster Analysis. Bulletin of the Seismological Society of America, 95 (3). pp. 904-915. ISSN 0037-1106. https://resolver.caltech.edu/CaltechAUTHORS:20130227-105056910

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Abstract

We obtain precise relative relocations for more than 340,000 southern California earthquakes between 1984 and 2002 by applying the source-specific station-term (ssst) method to existing P- and S-phase picks and a differential location method to about 208,000 events within similar-event clusters identified with waveform cross-correlation. The entire catalog is first relocated by using existing phase picks, a reference 1D velocity model, and the ssst method of Richards-Dinger and Shearer (2000). We also perform separate relocations of Imperial Valley events by using a velocity model more suited to this region. Next, we apply cluster analysis to the waveform cross-correlation output to identify similar-event clusters. We relocate earthquakes within each similar-event cluster by using the differential times alone, keeping the cluster centroid fixed to its initial ssst location. We estimate standard errors for the relative locations from the internal consistency of differential locations between individual event pairs; these errors are often as small as tens of meters. In many cases the relocated events within each similar-event cluster align in planar features suggestive of faults. We observe a surprising number of such faults at small scales that strike nearly perpendicular to the main seismicity trends. In general, the fine-scale details of the seismicity reveal a great deal of structural complexity in southern California fault systems.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1785/01200401168 DOIArticle
http://bssa.geoscienceworld.org/content/95/3/904.abstractPublisherArticle
ORCID:
AuthorORCID
Shearer, Peter0000-0002-2992-7630
Hauksson, Egill0000-0002-6834-5051
Additional Information:© 2005 Bulletin of the Seismological Society of America. Manuscript received 23 August 2004. We thank the personnel of the USGS/Caltech Southern California Seismic Network who pick and archive the seismograms and the Southern California Earthquake Center (SCEC) for distributing the data; we thank Vikki Appel, who facilitated access to the database. Cliff Thurber and an anonymous reviewer provided constructive comments. Funding for this research was provided by NEHRP/USGS Grant 03HQPA0001. This research was also supported by the Southern California Earthquake Center, which is funded by NSF Cooperative Agreement EAR-0106924 and USGS Cooperative Agreement 02HQAG0008. SCEC contribution no. 784. Contribution 9106 of Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGS03HQPA0001
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-0106924
USGS02HQAG0008
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)784
Caltech Division of Geological and Planetary Sciences9106
Issue or Number:3
Record Number:CaltechAUTHORS:20130227-105056910
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130227-105056910
Official Citation:Peter Shearer, Egill Hauksson, and Guoqing Lin Southern California Hypocenter Relocation with Waveform Cross-Correlation, Part 2: Results Using Source-Specific Station Terms and Cluster Analysis Bulletin of the Seismological Society of America, June 2005, v. 95, p. 904-915, doi:10.1785/0120040168
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37175
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:27 Feb 2013 22:09
Last Modified:03 Oct 2019 04:45

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