Deep processes and dynamic responses associated with the Wenchuan M(s)8.0 earthquake of 2008

	Deep processes and dynamic responses associated with the Wenchuan M(s)8.0 earthquake of 2008
	Teng Ji-Wen; Bai Deng-Hai; Yang Hui; Yan Ya-Feng; Zhang Hong-Shuang; Zhang Yong-Qian; Ruan Xiao-Min
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2008-09-01
卷号	51 期号:5 页码:1385-1402
关键词	Wenchuan earthquake material flow deep process convergence zone dynamic response
ISSN号	0001-5733
文献子类	Article
英文摘要	The Wenchuan M(s)8.0 earthquake of 2008 occurred on the Longmenshan tectonic zone which seems not very active from available data. And it is reported that no noticeable precursors have been observed before the event. It might imply that the crustal deformation at depth associated with this gigantic shock had no expression on the surface or shallow subsurface which was detectable. In this article, we attempt to analyze the processes of brewing and generation of this event at depth that can account for the reason of this devastating earthquake. Tectonically, it is obvious that the India-Eurasia plate collision serves as the most important dynamic setting of major earthquakes in southwestern China. The eastern end of the Himalayan chain is moving rapidly in NNE direction into the Tibetan plateau, forcing deep material to flow toward east. Due to the obstruction of the NE trending Longmenshan tectonic zone in the northwestern margin of the Sichuan basin, the partial flow turns to southeast. Longmenshan is a conspicuous boundary of topography and crust structure! across which the elevation difference is as large as 3500 500 m, with crustal thickness 60 +/- 5km in its west and 40 +/- 2 km in its east, respectively. Thus it must experiences intense deformation and stress accumulation. though very slow without appreciable manifestation. Based on available data, it is inferred that material of lower crust and covering strata of upper mantle is flowing eastward along two deep slide surfaces, of which one is the layer of low-velocity and low-resistivity (20 similar to 25 km depth), and the other is the top of mantle asthenosphere. Hindered by rigid mattter beneath the Sichuan basin, the flow of lower crust and covering strata of upper mantle material turns overthrusting at high angles at the Longmenshan. On the other hand, three thrust faults visible west of the Longmenshan extend downward to depth 20 km, where they converge into one active zone. Thus the Longmenshan tectonic zone is a place where occurs the coupling between slippage on faults of shallow subsurface and material flow of lower crust and covering strata of upper mantle. Under the intense exchange of matter and energy, the source medium ruptures suddenly at a large scale to release a huge amount of elastic strain, resulting in the Wenchuan M(s)8.0 earthquake.
WOS关键词	TIBETAN PLATEAU ; FAULT ZONE ; CHINA ; SICHUAN ; EVOLUTION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000259591000012
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69000]
专题	中国科学院地质与地球物理研究所
通讯作者	Teng Ji-Wen
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Teng Ji-Wen,Bai Deng-Hai,Yang Hui,et al. Deep processes and dynamic responses associated with the Wenchuan M(s)8.0 earthquake of 2008[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2008,51(5):1385-1402.
APA	Teng Ji-Wen.,Bai Deng-Hai.,Yang Hui.,Yan Ya-Feng.,Zhang Hong-Shuang.,...&Ruan Xiao-Min.(2008).Deep processes and dynamic responses associated with the Wenchuan M(s)8.0 earthquake of 2008.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,51(5),1385-1402.
MLA	Teng Ji-Wen,et al."Deep processes and dynamic responses associated with the Wenchuan M(s)8.0 earthquake of 2008".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 51.5(2008):1385-1402.