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Crustal stress field in southern California and its implications for fault mechanics

Hardebeck, Jeanne L. and Hauksson, Egill (2001) Crustal stress field in southern California and its implications for fault mechanics. Journal of Geophysical Research B, 106 (B10). pp. 21859-21882. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20130514-103234284

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Abstract

We present a new, high spatial resolution image of stress orientation in southern California based on the inversion of earthquake focal mechanisms. We use this image to study the mechanics of faulting in the plate boundary region. The stress field contains significant spatial heterogeneity, which in some cases appears to be a result of the complexity of faulting and in other cases appears to be a cause. Temporal changes in the stress field are also observed, primarily related to major earthquakes. The observed 15° (±10°) rotation of the stress axes due to the 1992 M7.3 Landers mainshock implies that the deviatoric stress magnitude in the crust is low, of the order of 10 MPa. This suggests that active faults in southern California are weak. The maximum principal stress axis near the San Andreas Fault is often at ∼50° to the fault strike, indicating that the shear stress on the fault is comparable to the deviatoric stress. The San Andreas in southern California may therefore be a weak fault in a low-strength crust.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2001JB000292DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2001JB000292/abstractPublisherArticle
ORCID:
AuthorORCID
Hauksson, Egill0000-0002-6834-5051
Additional Information:© 2001 American Geophysical Union. Manuscript Accepted: 4 April 2001; Manuscript Received: 28 September 2000. We thank Andy Michael for providing us with his stress inversion code and for valuable discussions about stress inversion techniques. John Townend and Yukinobi Sugihara kindly shared their stress inversion results. The manuscript was greatly improved by constructive comments from Craig Nicholson and an anonymous reviewer. This work was partially supported by U.S. Geological Survey grant 01HQGR0038 and partially supported by the Southern California Earthquake Center (SCEC), which is funded by NSF Cooperative Agreement EAR-8920136 and USGS Cooperative Agreements 14-08-0001-A0899 and 1434-HQ-97AG01718. SCEC contribution 541. Contribution 8720, Caltech Division of Geological and Planetary Sciences.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGS01HQGR0038
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSFEAR-8920136
USGS14-08-0001-A0899
USGS1434-HQ-97AG01718
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)541
Caltech Division of Geological and Planetary Sciences8720
Issue or Number:B10
Record Number:CaltechAUTHORS:20130514-103234284
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130514-103234284
Official Citation:Hardebeck, J. L., and E. Hauksson (2001), Crustal stress field in southern California and its implications for fault mechanics, J. Geophys. Res., 106(B10), 21859–21882, doi:10.1029/2001JB000292.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38489
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:14 May 2013 20:48
Last Modified:03 Oct 2019 04:57

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