Waveform Relocated Earthquake Catalog for Southern California (1981 to June 2011)
Abstract
We determine a new relocated catalog, HYS_catalog_2011, for southern California from 1981 through June 2011. About 75.3% of the hypocenters are calculated with absolute and differential travel‐time picks, and 24.7% could be relocated only by using absolute travel‐time picks with 3D or 1D velocity models. The total catalog consists of more than 502,000 earthquakes in the region extending from Baja California in the south to Coalinga and Owens Valley in the north. The catalog consists of three M 7.1, M 7.2, and M 7.3 mainshocks; their foreshocks and aftershocks; and background seismicity caused by tectonic and other processes in the southern California crust. Hypocenters in the new relocated catalog exhibit tighter spatial clustering of seismicity than does the routinely generated catalog, and the depth distribution is tighter and reflects the thickness of the seismogenic zone more accurately. Compared to the standard catalog, the relocated hypocenters are more easily related to other data sets, such as mapped late Quaternary faults.
Additional Information
© 2012 by the Seismological Society of America. Manuscript received 25 November 2011. This research was supported by the U.S. Geological Survey Grants G11AP20032 and G12AP20010 and by the Southern California Earthquake Center (SCEC), which is funded by NSF Cooperative Agreement EAR-0106924 and USGS Cooperative Agreement 02HQAG0008. The SCEC contribution number is 1528. The publication number of the Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena is 10069. We are grateful to the operators and analysts who maintain the USGS/Caltech Southern California Seismic Network and who pick and archive the seismograms. Some of the computer codes used in this project were originally written and/or modified by G. Lin. We thank L. Jones and M. Boese for comments on the manuscript.Attached Files
Published - 2239.full.pdf
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Additional details
- Eprint ID
- 35234
- Resolver ID
- CaltechAUTHORS:20121101-103757802
- G11AP20032
- USGS
- G12AP20010
- USGS
- Southern California Earthquake Center (SCEC)
- EAR-0106924
- NSF
- 02HQAG0008
- USGS
- Created
-
2012-11-01Created 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
- Caltech Seismological Laboratory
- Other Numbering System Identifier
- 10069