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The 2001 M_w 7.6 Bhuj earthquake, low fault friction, and the crustal support of plate driving forces in India

Copley, Alex and Avouac, Jean-Philippe and Hollingsworth, James and Leprince, Sébastien (2011) The 2001 M_w 7.6 Bhuj earthquake, low fault friction, and the crustal support of plate driving forces in India. Journal of Geophysical Research B, 116 . Art. No. B08405. ISSN 0148-0227. doi:10.1029/2010JB008137.

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We present a source model for the 2001 M_w 7.6 Bhuj earthquake of northwest India. The slip distribution suggests a high stress drop (~35 MPa) and, together with the depth distribution of aftershocks, that the entire crust is seismogenic. We suggest that the active faults have an effective coefficient of friction of ~0.08, which is sufficient for the seismogenic crust to support the majority of the compressive force transmitted through the Indian lithosphere. This model is consistent with the midcrustal depth of the transition from extension to compression beneath the Ganges foreland basin where India underthrusts southern Tibet. If the coefficient of friction were the more traditional value of 0.6, the lithosphere would be required to support a net force roughly an order of magnitude higher than current estimates in order to match the observed depth of the neutral fiber.

Item Type:Article
Related URLs:
Avouac, Jean-Philippe0000-0002-3060-8442
Hollingsworth, James0000-0003-0122-296X
Leprince, Sébastien0000-0003-4555-8975
Additional Information: © 2011 American Geophysical Union. Received 1 December 2010; accepted 7 June 2011; published 19 August 2011. We thank the Gordon and Betty Moore Foundation for funding this study through the Caltech Tectonics Observatory and Pembroke College in the University of Cambridge for financial support to A.C. We are grateful to D. Schmidt and R. Bürgmann for providing us with their InSAR results. Two anonymous reviewers provided helpful comments on the manuscript.
Group:Seismological Laboratory
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
University of Cambridge Pembroke CollegeUNSPECIFIED
Subject Keywords:Bhuj earthquake; coefficient of friction; continental rheology
Record Number:CaltechAUTHORS:20110909-110934158
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Official Citation:Copley, A., J.-P. Avouac, J. Hollingsworth, and S. Leprince (2011), The 2001 Mw 7.6 Bhuj earthquake, low fault friction, and the crustal support of plate driving forces in India, J. Geophys. Res., 116, B08405, doi:10.1029/2010JB008137.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25272
Deposited By: Tony Diaz
Deposited On:09 Sep 2011 18:50
Last Modified:09 Nov 2021 16:31

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