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题名:
Geodynamic background of the 2008 Wenchuan earthquake based on 3D visco-elastic numerical modelling
作者: Liu Chang1,2,3; Zhu BJ(朱伯靖)4; Yang Xiaolin5; Shi Yaolin3
刊名: Physics of the Earth and Planetary Interiors
出版日期: 2016-03
卷号: 252, 页码:23-36
DOI: 10.1016/j.pepi.2016.01.003
学科分类: 地球科学::固体地球物理学
收录类别: SCI
通讯作者: Liu Chang, Email: liu@geologie.ens.fr
关键词: Wenchuan earthquake ; Lushan earthquake ; Longmen Shan fault ; Stress concentration ; Viscosity contrast
英文摘要: 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
原文出处: 查看原文
ISSN号: 0031-9201
文章类型: Article
研究领域[WOS]: Geochemistry & Geophysics
类目[WOS]: 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
WOS记录号: WOS:000371840900002
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内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12312
Appears in Collections:非本单位_期刊论文

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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

Recommended Citation:
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.
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