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Estimate of differential stress in the upper crust from variations in topography and strike along the San Andreas fault

Fialko, Yuri and Rivera, Luis and Kanamori, Hiroo (2005) Estimate of differential stress in the upper crust from variations in topography and strike along the San Andreas fault. Geophysical Journal International, 160 (2). pp. 527-532. ISSN 0956-540X. doi:10.1111/j.1365-246X.2004.02511.x. https://resolver.caltech.edu/CaltechAUTHORS:20141111-093049528

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Abstract

The major bends of the San Andreas fault in California are associated with significant variations in the along-fault topography. The topography-induced perturbations in the intermediate principal stress may result in the rotation of the fault with respect to the maximum compression axis provided that the fault is non-vertical, and the slip is horizontal. The progressive fault rotation may produce additional topography via thrust faulting in the adjacent crust, resulting in a positive feedback. The observed rotation of the fault plane due to the along-fault variations in topography is used to infer the magnitude of the in situ differential stress. Our results suggest that the average differential stress in the upper crust around the San Andreas fault is of the order of 50 MPa, implying that the effective fault strength is about a factor of two lower than predictions based on Byerlee's law and the assumption of hydrostatic pore pressure.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-246X.2004.02511.x DOIArticle
http://gji.oxfordjournals.org/content/160/2/527PublisherArticle
ORCID:
AuthorORCID
Fialko, Yuri0000-0002-6161-8467
Rivera, Luis0000-0002-0726-5445
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2004 RAS. Accepted 2004 October 15; Received 2004 September 15; in original form 2004 April 21. We thank two anonymous reviewers and the Editor Cindy Ebinger for their insightful comments and suggestions. This material is based upon work partially supported by the National Science Foundation under Grant EAR-0338061, and the Southern California Earthquake Center (SCEC). SCEC is funded by NSF Cooperative Agreement EAR-0106924 and USGS Cooperative Agreement 02HQAG0008. The SCEC contribution number for this paper is 806.
Funders:
Funding AgencyGrant Number
NSFEAR-0338061
Southern California Earthquake Center (SCEC)UNSPECIFIED
NSF Cooperative AgreementEAR-0106924
USGS Cooperative Agreement02HQAG0008
Subject Keywords:crustal deformation; fault tectonics; rock fracture; San Andreas fault; seismotectonics; transform faults
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center806
Issue or Number:2
DOI:10.1111/j.1365-246X.2004.02511.x
Record Number:CaltechAUTHORS:20141111-093049528
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141111-093049528
Official Citation:Yuri Fialko, Luis Rivera, and Hiroo Kanamori Estimate of differential stress in the upper crust from variations in topography and strike along the San Andreas fault Geophys. J. Int. (2005) 160 (2): 527-532 doi:10.1111/j.1365-246X.2004.02511.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51553
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Nov 2014 21:47
Last Modified:10 Nov 2021 19:12

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