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Fault-perpendicular aftershock clusters following the 2003 Mw = 5.0 Big Bear, California, earthquake

Chi, Wu-Cheng and Hauksson, Egill (2006) Fault-perpendicular aftershock clusters following the 2003 Mw = 5.0 Big Bear, California, earthquake. Geophysical Research Letters, 33 (7). Art. No. L07301. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20130215-082542381

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Abstract

To explore aftershock-triggering mechanisms for the 2003 Big Bear, California earthquake sequence, we determined differential travel-times and applied the double-difference technique to relocate these events, which formed three clusters. The main cluster coincides with the 3 km long northwest striking sub-vertical mainshock fault. The other two sub-vertical clusters, located at opposite ends of the mainshock rupture, are almost perpendicular to the mainshock fault, contradicting the 60° separation angle of conjugate faults as predicted from frictional laws. Allowing for a 30° uncertainty in the cataloged strike, dip and rake values about 75% of the aftershocks are strike-slip as determined from first motion and complete waveform moment tensor inversions. We use a mainshock conceptual slip model to derive Coulomb Failure Stress regions, and assess correlations between stress increases and aftershock locations. We conclude that the perpendicular aftershock clusters were triggered by the mainshock static stress perturbation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2005GL025033 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2005GL025033/abstractPublisherArticle
ORCID:
AuthorORCID
Hauksson, Egill0000-0002-6834-5051
Additional Information:© 2006 by the American Geophysical Union. Received 9 November 2005; revised 9 February 2006; accepted 14 February 2006; published 1 April 2006. We thank Debi Kilb for reviewing the manuscript. This study is partially supported by NEHRP/USGS Grant 04HQGR0052 and by SCEC, which is funded by NSF Cooperative Agreement EAR-0106924 and USGS Cooperative Agreement 02HQAG0008; SCEC contribution number 959. Additional supports came from National Science Council of Taiwan (NSC 94-2119-M-001, IESAS1113). Contribution number 9136, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NEHRP/USGS04HQGR0052
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-0106924
USGS02HQAG0008
National Science Council (Taipei)NSC 94-2119-M-001, IESAS1113
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)959
Caltech Division of Geological and Planetary Sciences9136
Issue or Number:7
Record Number:CaltechAUTHORS:20130215-082542381
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130215-082542381
Official Citation:Chi, W.-C., and E. Hauksson (2006), Fault-perpendicular aftershock clusters following the 2003 Mw = 5.0 Big Bear, California, earthquake, Geophys. Res. Lett., 33, L07301, doi:10.1029/2005GL025033
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36938
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Feb 2013 00:00
Last Modified:03 Oct 2019 04:43

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