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On the use of dislocations to model interseismic strain and stress build-up at intracontinental thrust faults

Vergne, J. and Cattin, R. and Avouac, J. P. (2001) On the use of dislocations to model interseismic strain and stress build-up at intracontinental thrust faults. Geophysical Journal International, 147 (1). pp. 155-162. ISSN 0956-540X. https://resolver.caltech.edu/CaltechAUTHORS:20120910-133723809

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Abstract

Creeping dislocations in an elastic half-space are commonly used to model interseismic deformation at subduction zones, and might also apply to major intracontinental thrust faults such as the Main Himalayan Thrust. Here, we compare such models with a more realistic 2-D finite element model that accounts for the mechanical layering of the continental lithosphere and surface processes, and that was found to fit all available constraints on interseismic and long-term surface displacements. These can also be fitted satisfactorily from dislocation models. The conventional back-slip model, commonly used for subduction zones, may, however, lead to a biased inference about the geometry of the locked portion of the thrust fault. We therefore favour the use of a creeping buried dislocation that simulates the ductile shear zone in the lower crust. A limitation of dislocation models is that the mechanical response of the lithosphere to the growth of the topography by bending of the elastic cores and ductile flow in the lower crust cannot be easily introduced. Fortunately these effects can be neglected because we may assume, to first order, a stationary topography. Moreover, we show that not only can dislocation models be used to adjust surface displacements but, with some caution, they can also provide a physically sound rationale to interpret interseismic microseismicity in terms of stress variations.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1046/j.1365-246X.2001.00524.xDOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-246X.2001.00524.x/abstractPublisherUNSPECIFIED
Additional Information:© 2001 RAS. Accepted 2001 May 23. Received 2001 March 8; in original form 2000 June 30. Article first published online: 9 Oct. 2008. We thank K. Regenauer-Lieb and J. C. Savage for their thoughtful comments. We are grateful to Y. Okdada for providing his Fortran routines from his 1992 paper and to J. Chéry for the finite element code ADELI.
Group:Seismological Laboratory
Subject Keywords:continental deformation; dislocation; flexure of the lithosphere; seismotectonics
Issue or Number:1
Record Number:CaltechAUTHORS:20120910-133723809
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120910-133723809
Official Citation:Vergne, J., Cattin, R. and Avouac, J. P. (2001), On the use of dislocations to model interseismic strain and stress build-up at intracontinental thrust faults. Geophysical Journal International, 147: 155–162. doi: 10.1046/j.1365-246X.2001.00524.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33969
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Sep 2012 20:56
Last Modified:03 Oct 2019 04:14

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