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Fast, accurate solutions for curvilinear earthquake faults and anelastic strain

Landry, Walter and Barbot, Sylvain (2018) Fast, accurate solutions for curvilinear earthquake faults and anelastic strain. . (Submitted) http://resolver.caltech.edu/CaltechAUTHORS:20181009-085442534

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Abstract

Imaging the anelastic deformation within the crust and lithosphere using surface geophysical data remains a significant challenge in part due to the wide range of physical processes operating at different depths and to various levels of localization that they embody. Models of Earth's elastic properties from seismological imaging combined with geodetic modeling may form the basis of comprehensive rheological models of Earth's interior. However, representing the structural complexity of faults and shear zones in numerical models of deformation still constitutes a major difficulty. Here, we present numerical techniques for high-precision models of deformation and stress around both curvilinear faults and volumes undergoing anelastic (irreversible) strain in a heterogenous elastic half-space. To that end, we enhance the software Gamra to model triangular and rectangular fault patches and tetrahedral and cuboidal strain volumes. This affords a means of rapid and accurate calculations of elasto-static Green's functions for localized (e.g., faulting) and distributed (e.g., viscoelastic) deformation in Earth's crust and lithosphere. We demonstrate the correctness of the method with analytic tests, and we illustrate its practical performance by solving for coseismic and postseismic deformation following the 2015 Mw 7.8 Gorkha, Nepal earthquake to extremely high precision.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
https://arxiv.org/abs/1802.08931arXivDiscussion Paper
Additional Information:This research was supported by the National Research Foundation of Singapore under the NRF Fellowship scheme (National Research Fellow Award No. NRF-NRFF2013-04) and by the Earth Observatory of Singapore and the National Research Foundation and the Singapore Ministry of Education under the Research Centres of Excellence initiative. This is EOS publication 184.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
National Research Foundation (Singapore)NRF-NRFF2013-04
Earth Observatory of SingaporeUNSPECIFIED
Ministry of Education (Singapore)UNSPECIFIED
Record Number:CaltechAUTHORS:20181009-085442534
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181009-085442534
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90179
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Oct 2018 17:29
Last Modified:09 Oct 2018 17:29

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