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Geodynamic background of the 2008 Wenchuan earthquake based on 3D visco-elastic numerical modelling
Liu Chang1,2,3; Zhu BJ(朱伯靖)4; Yang Xiaolin5; Shi Yaolin3
Source PublicationPhysics of the Earth and Planetary Interiors
2016-03
Volume252Pages:23-36
DOI10.1016/j.pepi.2016.01.003
Indexed BySCI
KeywordWenchuan Earthquake Lushan Earthquake Longmen Shan Fault Stress Concentration Viscosity Contrast
Abstract

The 2008 Wenchuan earthquake (Mw7.9) occurred in the Longmen Shan fault zone. The stress change and crustal deformation during the accumulation period is computed using 3D finite element modelling assuming visco-elastic rheology. Our results support that the eastward movement of the Tibetan Plateau resulting from the India-Eurasia collision is obstructed at the Longmen Shan fault zone by the strong Yangtze craton. In response, the Tibetan ductile crust thickens and accumulates at the contact between the Tibetan Plateau and the Sichuan Basin. This process implies a strong uplift with the rate of about 1.8 mm/a of the upper crust and induces a stress concentration nearly at the bottom of the Longmen Shan fault zone. We believe that the stress concentration in the Longmen Shan fault zone provides a very important geodynamic background of the 2008 Wenchuan earthquake. Using numerical experiments we find that the key factor controlling this stress concentration process is the large viscosity contrast in the middle and lower crusts between the Tibetan Plateau and the Sichuan Basin. The results show that large viscosity contrast in the middle and lower crusts accelerates the stress concentration in the Longmen Shan fault zone. Fast moving lower crustal flow accelerates this stress accumulation process. During the inter-seismic period, spatially the maximum stress accumulation rate of the eastern margin of the Tibetan Plateau is located nearly at the bottom of the brittle upper crust of the Longmen Shan fault zone. The spatial distribution of the stress accumulation along the strike of the Longmen Shan fault zone is as follows: the normal stress decreases while the shear stress increases from southwest to northeast along the Longmen Shan fault zone. This stress distribution explains the thrust motion in the SW and strike-slip motion in the NE during the 2008 Wenchuan earthquake. (C) 2016 Elsevier B.V. All rights reserved.

Funding ProjectNational Natural Science Foundation of China[41404075] ; National Natural Science Foundation of China[41590860] ; CAS/CAFEA international partnership Program for creative research teams[KZZD-EW-TZ-19] ; China National Science and Technology Support Program[2012BAK19B03-5] ; China Geological Survey[12120114002401]
Funding OrganizationNational Natural Science Foundation of China[41404075, 41590860] ; CAS/CAFEA international partnership Program for creative research teams[KZZD-EW-TZ-19] ; China National Science and Technology Support Program[2012BAK19B03-5] ; China Geological Survey[12120114002401]
Language英语
Subject Area固体地球物理学
MOST Discipline Catalogue理学 ; 理学::地球物理学
SubtypeArticle
PublisherELSEVIER SCIENCE BV
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN0031-9201
URL查看原文
WOS IDWOS:000371840900002
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS KeywordLOWER CRUSTAL FLOW ; SEISMIC VELOCITY STRUCTURE ; EASTERN TIBETAN PLATEAU ; 6.6 LUSHAN EARTHQUAKE ; M(S)8.0 EARTHQUAKE ; LONGMEN-SHAN ; FAULT ZONE ; ANISOTROPIC TOMOGRAPHY ; TECTONIC IMPLICATIONS ; CONTINENTAL-CRUST
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12312
Collection个人在本单位外知识产出
Corresponding AuthorLiu Chang
Affiliation1.School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, China
2.Laboratoire de Géologie, CNRS-UMR 8538, École Normale Supérieure, Paris, France
3.Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, China
4.Department of Earth Sciences, University of Durham, Durham, UK
5.Earthquake Administration of Shaanxi Province, Xi’an, China
Recommended Citation
GB/T 7714
Liu Chang,Zhu BJ,Yang Xiaolin,et al. Geodynamic background of the 2008 Wenchuan earthquake based on 3D visco-elastic numerical modelling[J]. Physics of the Earth and Planetary Interiors,2016,252:23-36.
APA Liu Chang,Zhu BJ,Yang Xiaolin,&Shi Yaolin.(2016).Geodynamic background of the 2008 Wenchuan earthquake based on 3D visco-elastic numerical modelling.Physics of the Earth and Planetary Interiors,252,23-36.
MLA Liu Chang,et al."Geodynamic background of the 2008 Wenchuan earthquake based on 3D visco-elastic numerical modelling".Physics of the Earth and Planetary Interiors 252(2016):23-36.
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