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Crustal rheology control on earthquake activity across the eastern margin of the Tibetan Plateau: Insights from 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Journal of Asian Earth SciencesA
2015-03
卷号100页码:20-30
DOI10.1016/j.jseaes.2015.01.001
收录类别SCI
关键词Eastern Tibetan Plateau Longmen Shan Fault Wenchuan Earthquake Lushan Earthquake Stress Concentration Crustal Rheology
摘要The devastating 2008 Mw7.9 Wenchuan and 2013 Mw6.6 Lushan earthquakes occurred in the Longmen Shan (LMS) fault zone, the eastern margin of the Tibetan Plateau. Seismology investigation reveals that earthquakes of Ms >5.0 are frequently recorded in the eastern Tibetan Plateau, however rare earthquake of Ms > 5.0 and only a few earthquakes of 3.0 < Ms < 5.0 have been recorded in the Sichuan Basin. This study investigates the relation between the crustal rheology and the earthquake activity across the eastern margin of the Tibetan Plateau through 3D numerical experiments assuming visco-elasticity rheology. We setup several finite element lithospheric models based on different rheological structure. The interseismic stress accumulation processes in the models are simulated with boundary conditions of steady compressional deformation rate constrained by GPS observations. The results show that the crustal stress accumulation process across the eastern margin of the Tibetan Plateau is significantly controlled by the regional crustal rheology, which presents large horizontal viscosity variation in the lower crusts between the Tibetan Plateau and the Sichuan Basin. The stress accumulation rate in the upper crust of the eastern Tibetan Plateau is much higher than the Sichuan Basin. This stress spatial distribution explains the seismology observation that earthquakes are densely recorded in the eastern Tibetan Plateau, whereas rarely in the Sichuan Basin. The stress concentration nearly at the bottom of the entire LMS fault zone is thought to be responsible for the generation of the 2008 Mw7.9 Wenchuan and 2013 Mw6.6 Lushan earthquakes. There is a high possibility of future earthquakes in the seismic gaps at the southwest segment of the LMS fault zone, where it was stress accumulated but did not rupture during the last two events of the 2008 Wenchuan and 2013 Lushan earthquakes. 
项目资助者National Natural Science Foundation of China(41404075) ; 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
ISSN1367-9120
URL查看原文
WOS记录号WOS:000350524000002
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
关键词[WOS]2008 WENCHUAN EARTHQUAKE ; SEISMIC VELOCITY STRUCTURE ; LUSHAN EARTHQUAKE ; LITHOSPHERIC DEFORMATION ; ANISOTROPIC TOMOGRAPHY ; CONTINENTAL-CRUST ; STRESS CHANGES ; SICHUAN BASIN ; LONGMEN-SHAN ; UPPER-MANTLE
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12315
专题个人在本单位外知识产出
通讯作者Liu Chang, Email: liu@geologie.ens.fr
作者单位1.Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, Wuhan, China
2.Laboratoire de Géologie, CNRS-UMR 8538, École Normale Supérieure, Paris, France
3.Key Laboratory of Computational Geodynamics of the Chinese Academy of Sciences, Beijing, China
4.Department of Earth Sciences, University of Durham, Durham, UK
5.Earthquake Administration of Shaanxi Province, Xi’an, Shaanxi Province, China
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GB/T 7714
Liu Chang,Zhu BJ,Yang Xiaolin,et al. Crustal rheology control on earthquake activity across the eastern margin of the Tibetan Plateau: Insights from numerical modelling[J]. Journal of Asian Earth SciencesA,2015,100:20-30.
APA Liu Chang,Zhu BJ,Yang Xiaolin,Shi Yaolin,&Liu Chang, Email: liu@geologie.ens.fr.(2015).Crustal rheology control on earthquake activity across the eastern margin of the Tibetan Plateau: Insights from numerical modelling.Journal of Asian Earth SciencesA,100,20-30.
MLA Liu Chang,et al."Crustal rheology control on earthquake activity across the eastern margin of the Tibetan Plateau: Insights from numerical modelling".Journal of Asian Earth SciencesA 100(2015):20-30.
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