Applying a three-dimensional velocity model, waveform cross correlation, and cluster analysis to locate southern California seismicity from 1981 to 2005
- Creators
- Lin, Guoqing
-
Shearer, Peter M.
-
Hauksson, Egill
Abstract
We compute high-precision earthquake locations using southern California pick and waveform data from 1981 to 2005. Our latest results are significantly improved compared to our previous catalog by the following: (1) We locate events with respect to a new crustal P and S velocity model using three-dimensional ray tracing, (2) we examine six more years of waveform data and compute cross-correlation results for many more pairs than our last analysis, and (3) we compute locations within similar event clusters using a new method that applies a robust fitting method to obtain the best locations satisfying all the differential time constraints from the waveform cross correlation. These results build on the relocated catalogs of Hauksson and Shearer (2005) and Shearer et al. (2005) and provide additional insight regarding the fine-scale fault structure in southern California and the relationship between the San Andreas Fault (SAF) and nearby seismicity. In particular, we present results for two regions in which the seismicity near the southern SAF seems to align on dipping faults.
Additional Information
© 2007 by the American Geophysical Union. Received 14 February 2007; revised 27 August 2007; accepted 13 September 2007; published 29 December 2007. We thank Cliff Thurber for his SIMULPS tomography package and Paul Wessel and Walter Smith for developing and supporting the GMT mapping tools (http://gmt.soest.hawaii.edu/). We also thank Steve Cohen, Keith Richards-Dinger, and an anonymous reviewer for their detailed and constructive reviews. 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. This is SCEC contribution 1064.Attached Files
Published - jgrb15304.pdf
Files
| Name | Size | Download all |
|---|---|---|
|
md5:84d2cddf25260ec510f1a880a7dbc01b
|
8.5 MB | Preview Download |
Additional details
- Eprint ID
- 37947
- Resolver ID
- CaltechAUTHORS:20130415-140900351
- 03HQPA0001
- USGS
- Southern California Earthquake Center (SCEC)
- EAR-0106924
- NSF
- 02HQAG0008
- USGS
- Created
-
2013-04-15Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Seismological Laboratory, Division of Geological and Planetary Sciences
- Other Numbering System Name
- Southern California Earthquake Center (SCEC)
- Other Numbering System Identifier
- 1064