Hauksson, Egill and Oppenheimer, David and Brocher, Thomas M. (2004) Imaging the source region of the 2003 San Simeon earthquake within the weak Franciscan subduction complex, central California. Geophysical Research Letters, 31 (20). Art. No. L20607 . ISSN 0094-8276. doi:10.1029/2004GL021049. https://resolver.caltech.edu/CaltechAUTHORS:20130306-152907607
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Abstract
Data collected from the 2003 Mw6.5 San Simeon earthquake sequence in central California and a 1986 seismic refraction experiment demonstrate that the weak Franciscan subduction complex suffered brittle failure in a region without significant velocity contrast across a slip plane. Relocated hypocenters suggest a spatial relationship between the seismicity and the Oceanic fault, although blind faulting on a nearby, unknown fault is an equally plausible alternative. The aftershock volume is sandwiched between the Nacimiento and Oceanic faults and is characterized by rocks of low compressional velocity (Vp) abutted to the east and west by rocks of higher Vp. This volume of inferred Franciscan rocks is embedded within the larger Santa Lucia anticline. Pore fluids, whose presence is implied by elevated Vp/Vs values, may locally decrease normal stress and limit the aftershock depth distribution between 3 to 10 km within the hanging wall. The paucity of aftershocks along the mainshock rupture surface may reflect either the absence of a damage zone or an almost complete stress drop within the low Vp or weak rock matrix surrounding the mainshock rupture.
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| Additional Information: | © 2004 American Geophysical Union. Received 19 July 2004; revised 14 September 2004; accepted 6 October 2004; published 29 October 2004. The NCSN produced the data that were made available at the Northern California Earthquake Data Center. The figures were made using GMT [Wessel and Smith, 1991]. Supported by USGS/NEHRP Grant 04HQGR0052. Contribution # 9100, GPS, Caltech, Pasadena. | |||||||||
| Group: | Seismological Laboratory | |||||||||
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| Issue or Number: | 20 | |||||||||
| Classification Code: | Index terms: 7205 Seismology: Continental crust (1242); 7215 Seismology: Earthquake parameters; 7230 Seismology: Seismicity and seismotectonics | |||||||||
| DOI: | 10.1029/2004GL021049 | |||||||||
| Record Number: | CaltechAUTHORS:20130306-152907607 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130306-152907607 | |||||||||
| Official Citation: | Hauksson, E., D. Oppenheimer, and T. M. Brocher (2004), Imaging the source region of the 2003 San Simeon earthquake within the weak Franciscan subduction complex, central California, Geophys. Res. Lett., 31, L20607, doi:10.1029/2004GL021049. | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 37356 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | INVALID USER | |||||||||
| Deposited On: | 07 Mar 2013 00:13 | |||||||||
| Last Modified: | 09 Nov 2021 23:28 |
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