A study of the Coulomb stress and seismicity rate changes induced by the 2008 M-w 7.9 Wenchuan earthquake, SW China

doi:10.1016/j.jseaes.2016.12.048

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	A study of the Coulomb stress and seismicity rate changes induced by the 2008 M-w 7.9 Wenchuan earthquake, SW China
	Hu, Junhua 1,2; Fu, Li-Yun 1; Sun, Weijia 1; Zhang, Yan 1
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2017-03-01
卷号	135 页码:303-319
关键词	Wenchuan Earthquake Coulomb Stress Change Seismicity Rate Change Seismic Hazard Potential Numerical Modeling
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2016.12.048
文献子类	Article
英文摘要	Correlations between the calculated Coulomb stress changes and observed seismicity rate changes after the Wenchuan earthquake are investigated in this article. Three improvements are made in the calculation of static stress change, including employing a dislocation method with triangular elements rather than traditional rectangular elements, setting up a more realistic source-slip model and a more complete receiver fault model, and resolving stress changes on assumed receiver faults with spatially variable focal mechanisms based on well-determined focal mechanisms at different calculation points. The recorded aftershocks are mapped for comparison with the spatial distribution of stress changes. The results indicate that the Wenchuan earthquake encourages not only three major fault systems (the East Kunlun, south of Xianshuihe and west of Qinling Southern Frontal) but also several other regions including Tazang, north of Min Jiang, north of Pingwu-Qingchuan and west of Chongqing. In particular, the eastern segment of Longriba is shown to be quite dangerous with dramatic stress increase. The influence of depth and frictional coefficient is analyzed. The depth of calculation beyond the depth range of the source model will make a significant difference to the stress-change map and thus cannot be neglected. Many aftershocks occurring in the stress shadow zone near the main rupture can be attributed to dynamic stress triggering and the fractal structure of the main fault. The observed seismicity rate changes are compared with the static stress changes. The results show that high background seismicity rates will amplify the effect of stress change. The observed seismicity rate changes support the forecast rate of 10-year seismicity after the Wenchuan earthquake based on the rate- and state-dependent friction model. Coulomb stresses increase on the focal mechanisms away from the main rupture, which demonstrates the influence of the Wenchuan earthquake over a wide range. Especially, the focal mechanism for Lushan earthquake undergoes a stress increase by more than 2.0 bars, which suggests that the Lushan earthquake has been effectively promoted by the Wenchuan earthquake. (c) 2016 Elsevier Ltd. All rights reserved.
WOS关键词	TOHOKU-OKI EARTHQUAKE ; SOUTHERN CALIFORNIA ; HALF-SPACE ; TENSILE FAULTS ; AFTERSHOCKS ; FAILURE ; SHADOWS ; MODEL ; DEFORMATION ; HAZARD
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000394484600023
资助机构	Natural Science Foundation of China(41204098 ; 41130418) ; Natural Science Foundation of China(41204098 ; 41130418) ; Natural Science Foundation of China(41204098 ; 41130418) ; Natural Science Foundation of China(41204098 ; 41130418)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/52995]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	Fu, Li-Yun
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Hu, Junhua,Fu, Li-Yun,Sun, Weijia,et al. A study of the Coulomb stress and seismicity rate changes induced by the 2008 M-w 7.9 Wenchuan earthquake, SW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,135:303-319.
APA	Hu, Junhua,Fu, Li-Yun,Sun, Weijia,&Zhang, Yan.(2017).A study of the Coulomb stress and seismicity rate changes induced by the 2008 M-w 7.9 Wenchuan earthquake, SW China.JOURNAL OF ASIAN EARTH SCIENCES,135,303-319.
MLA	Hu, Junhua,et al."A study of the Coulomb stress and seismicity rate changes induced by the 2008 M-w 7.9 Wenchuan earthquake, SW China".JOURNAL OF ASIAN EARTH SCIENCES 135(2017):303-319.