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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; Liu Chang, Email: liu@geologie.ens.fr
发表期刊Physics of the Earth and Planetary Interiors
2016-03
卷号252页码:23-36
DOI10.1016/j.pepi.2016.01.003
收录类别SCI
关键词Wenchuan Earthquake Lushan Earthquake Longmen Shan Fault Stress Concentration Viscosity Contrast
摘要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.
项目资助者National 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)
语种英语
学科领域固体地球物理学
文章类型Article
ISSN0031-9201
URL查看原文
WOS记录号WOS:000371840900002
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
关键词[WOS]LOWER 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
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12312
专题非本单位
通讯作者Liu Chang, Email: liu@geologie.ens.fr
作者单位1.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
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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,&Liu Chang, Email: liu@geologie.ens.fr.(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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