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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
Source PublicationJournal of Asian Earth SciencesA
2015-03
Volume100Pages:20-30
DOI10.1016/j.jseaes.2015.01.001
Indexed BySCI
KeywordEastern Tibetan Plateau Longmen Shan Fault Wenchuan Earthquake Lushan Earthquake Stress Concentration Crustal Rheology
Abstract

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. 

Funding ProjectNational 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]
Funding OrganizationNational 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]
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
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Publication PlaceTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN1367-9120
URL查看原文
WOS IDWOS:000350524000002
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS Keyword2008 WENCHUAN EARTHQUAKE ; SEISMIC VELOCITY STRUCTURE ; LUSHAN EARTHQUAKE ; LITHOSPHERIC DEFORMATION ; ANISOTROPIC TOMOGRAPHY ; CONTINENTAL-CRUST ; STRESS CHANGES ; SICHUAN BASIN ; LONGMEN-SHAN ; UPPER-MANTLE
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12315
Collection个人在本单位外知识产出
Corresponding AuthorLiu Chang
Affiliation1.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
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.(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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