气候变化领域集成服务门户(CCPortal): Strong earthquake clustering around the eastern Tibetan Plateau after the 2008 M(W)7.9 Wenchuan earthquake

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DOI	10.1007/s11430-019-9581-x
	Strong earthquake clustering around the eastern Tibetan Plateau after the 2008 M(W)7.9 Wenchuan earthquake
	Xu, Duyuan; Xiao, Jie; He, Jiankun; Wang, Weimin
通讯作者	He, JK (通讯作者)
发表日期	2020
ISSN	1674-7313
EISSN	1869-1897
起始页码	999
结束页码	1012
卷号	63 期号:7
英文摘要	After the 2008 M(W)7.9 Wenchuan earthquake, the eastern Tibetan Plateau experienced a series of M-W>6.0 earthquakes, including the 2013 M(W)6.6 Lushan, 2014 M(W)6.1 Kangding and 2017 M(W)6.5 Jiuzhaigou events. Based on available constraints, we build a three-dimensional viscoelastic finite element model to calculate Coulomb failure stress caused by these strong earthquakes. In this model, the geometry and slip vector of the initial rupture zone of each earthquake are used to better evaluate the earthquake-related stress projection. Considering reasonable ranges of viscosities for the crust and upper mantle in different tectonic units, numerical results show that after the Wenchuan earthquake, the coseismic Coulomb failure stress change at the hypocenters of the subsequent earthquakes increased to approximately +0.012-+0.040, +0.01-+0.03, and +0.008-+0.015 MPa, respectively. With viscoelastic relaxation of the lower crust and upper mantle, the Coulomb failure stress change at the hypocenters of these earthquakes accumulated to about +0.014-+0.042, +0.016-+0.036, and +0.003-+0.007 MPa just before their occurrence. This suggests that the Wenchuan earthquake indeed triggered or hastened the occurrence of the Lushan, Kangding and Jiuzhaigou events, supporting that strong earthquake clustering around the eastern Tibetan Plateau could be related to stress interaction between the seismogenic faults. Besides, -94% and -6% of the stress increase around (and before the occurrence of) the Kangding earthquake were contributed by the Wenchuan event and the Lushan event, respectively; the positive Coulomb failure stress change at the Jiuzhaigou earthquake hypocenter was related to coseismic slip partitioning of the Wenchuan earthquake. This means that stress interaction among the earthquakes could be controlled by the combined effect of stress of the previous events and by the complexity of earthquake ruptures. Thus, in researches on the earthquake-triggering mechanism, special attentions should be paid on both details of the rupture model and multiple factors of previous earthquakes.
关键词	COULOMB STRESS CHANGE JIUZHAIGOU EARTHQUAKE LUSHAN EARTHQUAKE RUPTURE PROCESS SAN-ANDREAS FAULT SICHUAN SLIP MODEL DEFORMATION
英文关键词	Earthquake clustering; Viscoelastic stress triggering; Finite element modeling; Wenchuan earthquake; Eastern
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000522592100002
来源期刊	SCIENCE CHINA-EARTH SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259678
推荐引用方式 GB/T 7714	Xu, Duyuan,Xiao, Jie,He, Jiankun,et al. Strong earthquake clustering around the eastern Tibetan Plateau after the 2008 M(W)7.9 Wenchuan earthquake[J]. 中国科学院青藏高原研究所,2020,63(7).
APA	Xu, Duyuan,Xiao, Jie,He, Jiankun,&Wang, Weimin.(2020).Strong earthquake clustering around the eastern Tibetan Plateau after the 2008 M(W)7.9 Wenchuan earthquake.SCIENCE CHINA-EARTH SCIENCES,63(7).
MLA	Xu, Duyuan,et al."Strong earthquake clustering around the eastern Tibetan Plateau after the 2008 M(W)7.9 Wenchuan earthquake".SCIENCE CHINA-EARTH SCIENCES 63.7(2020).