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题名:
Crustal rheology control on earthquake activity across the eastern margin of the Tibetan Plateau: Insights from numerical modelling
作者: Liu Chang1,2,3; Zhu BJ(朱伯靖)4; Yang Xiaolin5; Shi Yaolin3
刊名: Journal of Asian Earth SciencesA
出版日期: 2015-03
卷号: 100, 页码:20-30
DOI: 10.1016/j.jseaes.2015.01.001
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: Eastern Tibetan Plateau ; Longmen Shan fault ; Wenchuan earthquake ; Lushan earthquake ; Stress concentration ; Crustal rheology
英文摘要: 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
原文出处: 查看原文
ISSN号: 1367-9120
文章类型: Article
研究领域[WOS]: Geology
类目[WOS]: 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
WOS记录号: WOS:000350524000002
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12315
Appears in Collections:非本单位_期刊论文

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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

Recommended Citation:
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.
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