Wenchuan-Yingxiu M(s)8. 0 earthquake seismogenic faults and deep dynamic response

doi:10.6038/cjg20140206

	Wenchuan-Yingxiu M(s)8. 0 earthquake seismogenic faults and deep dynamic response
	Teng Ji-Wen; Pi Jiao-Long; Yang Hui; Yan Ya-Fen; Zhang Yong-Qian; Ruan Xiao-Min; Hu Guo-Ze
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2014-02-01
卷号	57 期号:2 页码:392-403
关键词	Wenchuan-Yingxiu M(s)8. 0 earthquake Seismogenic fault Upper and lower sliding surface The lower crust and upper mantle material synchronous motion Deep dynamic response
ISSN号	0001-5733
DOI	10.6038/cjg20140206
文献子类	Article
英文摘要	It is obvious that the India-Eurasia collision has formed the giant arc-like Himalayan belt. At the eastern Himalayan syntaxis, the Indian subcontinent plunges into the Tibetan plateau in NNE direction. Not only resulted in the Bayan Har block and Longmenshan fault system strong tectonic activity and deformation, but also resulted in the material of the hinterland of the plateau crust and upper mantle in the E-ES direction of migration to large strike-slip fault boundary for the channel. The Wenchuan-Yingxiu M(s)8. 0 earthquake of 2008, occurred on the Longmenshan fault system which lies in between the relative activities of the Bayan Har block and relatively stable Sichuan Basin. In the light of the structure of the crust and upper mantle and the distribution of the epicenter and focal depth of the main shock and its more than 70000 aftershaks, the seismogenic fault of Wenchuan-Yingxiu M(s)8. 0 earthquake is not the pojection position of the epicenter in surface. Three westly-vergent thrust faults seen on the surface in the Longmenshan extend downward at different angles and converge at depth 15 +/- 5 km, so it produced the convergence fracture (CF). Therefore this shear fault zone is the real triggering seismic fault which is responsible for the M(s)8. 0 event. It is actually a column-shaped source body striking in NE with radius 5 km centered at depth 15 +/- 5 km. In the process of deep material eastward and southeastern movement, the whole curst gradually rising and the Longmenshan fault system thinned then crust low velocity layer pinched in the northeastern margin of Qinghai-Tibet Plateau. There are two detachment interfaces at depth in this region, one is the low-velocity layer at depth 20 similar to 25 km in the upper and middle crust, the other is the top of the astheonsphere. Along these two interfaces, the materials of the lower crust and the lid in the upper mantle simultaneously transfer toward east. Due to the covering strata hinder of the deep rigid substance below the Sichuan basin, the material of the lower crust and upper mantle moves upward (thrusts) at a steep angle along the Longmenshan. 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. Based on the above, it is the key that we study the strong earthquake preparation, occurrence and development for deep environment of medium and structure and deep material and energy exchange, migration and deep dynamic process.
WOS关键词	TIBETAN PLATEAU ; LONGMEN SHAN ; TECTONIC IMPLICATIONS ; VELOCITY STRUCTURE ; SICHUAN BASIN ; ACTIVE FAULT ; UPPER-MANTLE ; CHINA ; MOVEMENT ; UPLIFT
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000332443600006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85753]
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,Pi Jiao-Long,Yang Hui,et al. Wenchuan-Yingxiu M(s)8. 0 earthquake seismogenic faults and deep dynamic response[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2014,57(2):392-403.
APA	Teng Ji-Wen.,Pi Jiao-Long.,Yang Hui.,Yan Ya-Fen.,Zhang Yong-Qian.,...&Hu Guo-Ze.(2014).Wenchuan-Yingxiu M(s)8. 0 earthquake seismogenic faults and deep dynamic response.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,57(2),392-403.
MLA	Teng Ji-Wen,et al."Wenchuan-Yingxiu M(s)8. 0 earthquake seismogenic faults and deep dynamic response".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 57.2(2014):392-403.