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Conference Paper: Finite element modelling of co-seismic deformation of the Longmenshan thrust belt associated with 2008 M=8 Sichuan earthquake
Title | Finite element modelling of co-seismic deformation of the Longmenshan thrust belt associated with 2008 M=8 Sichuan earthquake |
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Authors | |
Keywords | [0545] Computational Geophysics - Modeling [1242] Geodesy and Gravity - Seismic cycle related deformations [8011] Structural Geology - Kinematics of crustal and mantle deformation [8122] Tectonophysics - Dynamics: gravity and tectonics |
Issue Date | 2011 |
Publisher | American Geophysical Union. |
Citation | The 2011 Fall Meeting of the American Geophysical Union (AGU), San Francisco, CA., 5-9 December 2011. How to Cite? |
Abstract | The devastating 2008 M=8 Sichuan Earthquake occurred in the Longmenshan (LMS) fault zone which comprises mainly the Wenchuan, Beichuan, and Pengguan Faults, between the Tibet and Yangtze Blocks of south-central China. Co-seismic fault dislocations ranging from 1m to 6m, and variations in gravity value up to 1.50 mGal were reported. We constructed finite element models to simulate the co-seismic deformation and post-seismic viscoelastic and poroelaestic behavior of the epicentral region to explain the observed crustal deformation and changes in gravity. Geometry of the models was modified from the published crustal sections of the traverse. Young's modulus, Poisson ratio, viscosity and void ratio were used as modelling parameters. Stress and pore pressure fields introduced by the rapid co-seismic dislocations along the main faults provide the initial conditions for simulations of the post-seismic processes. The modeling results suggest that fluid migration probably accounts for crustal deformation (by a few cm) within the first six months of the event, assuming a porous upper crust. Visco-elastic response of the upper mantle (by a few tens of cm) persisted for several years. The model is consistent with observed changes in gravity. Localities in the Tibetan Plateau and Yangtze Block having a reversal in vertical displacement several years after the earthquake possibly reveal viscoelastic relaxation of the lower crust beneath the LMS fault zone. |
Description | abstract no. T23C-2418 |
Persistent Identifier | http://hdl.handle.net/10722/166365 |
DC Field | Value | Language |
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dc.contributor.author | Tung, S | en_US |
dc.contributor.author | Chan, L | en_US |
dc.contributor.author | Masterlark, T | en_US |
dc.date.accessioned | 2012-09-20T08:33:18Z | - |
dc.date.available | 2012-09-20T08:33:18Z | - |
dc.date.issued | 2011 | en_US |
dc.identifier.citation | The 2011 Fall Meeting of the American Geophysical Union (AGU), San Francisco, CA., 5-9 December 2011. | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/166365 | - |
dc.description | abstract no. T23C-2418 | - |
dc.description.abstract | The devastating 2008 M=8 Sichuan Earthquake occurred in the Longmenshan (LMS) fault zone which comprises mainly the Wenchuan, Beichuan, and Pengguan Faults, between the Tibet and Yangtze Blocks of south-central China. Co-seismic fault dislocations ranging from 1m to 6m, and variations in gravity value up to 1.50 mGal were reported. We constructed finite element models to simulate the co-seismic deformation and post-seismic viscoelastic and poroelaestic behavior of the epicentral region to explain the observed crustal deformation and changes in gravity. Geometry of the models was modified from the published crustal sections of the traverse. Young's modulus, Poisson ratio, viscosity and void ratio were used as modelling parameters. Stress and pore pressure fields introduced by the rapid co-seismic dislocations along the main faults provide the initial conditions for simulations of the post-seismic processes. The modeling results suggest that fluid migration probably accounts for crustal deformation (by a few cm) within the first six months of the event, assuming a porous upper crust. Visco-elastic response of the upper mantle (by a few tens of cm) persisted for several years. The model is consistent with observed changes in gravity. Localities in the Tibetan Plateau and Yangtze Block having a reversal in vertical displacement several years after the earthquake possibly reveal viscoelastic relaxation of the lower crust beneath the LMS fault zone. | - |
dc.language | eng | en_US |
dc.publisher | American Geophysical Union. | en_US |
dc.relation.ispartof | AGU Fall Meeting 2011 | en_US |
dc.rights | AGU Fall Meeting 2011. Copyright © American Geophysical Union. | en_US |
dc.rights | For postprint: An edited version of this paper was published by AGU. Copyright (year) American Geophysical Union. | en_US |
dc.subject | [0545] Computational Geophysics - Modeling | - |
dc.subject | [1242] Geodesy and Gravity - Seismic cycle related deformations | - |
dc.subject | [8011] Structural Geology - Kinematics of crustal and mantle deformation | - |
dc.subject | [8122] Tectonophysics - Dynamics: gravity and tectonics | - |
dc.title | Finite element modelling of co-seismic deformation of the Longmenshan thrust belt associated with 2008 M=8 Sichuan earthquake | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Chan, L: chanls@hku.hk | en_US |
dc.identifier.authority | Chan, L=rp00665 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.hkuros | 207525 | en_US |