Along-strike variation of the frontal zone structural geometry of the   Central Longmen Shan thrust belt revealed by seismic reflection profiles

doi:10.1016/j.tecto.2012.09.018

CORC > 北京大学 > 地球与空间科学学院

	Along-strike variation of the frontal zone structural geometry of the Central Longmen Shan thrust belt revealed by seismic reflection profiles
	Lu, Renqi ; He, Dengfa ; Suppe, John ; Ma, Yongsheng ; Liu, Bo ; Chen, Yuegau
刊名	tectonophysics
	2012
关键词	Seismic interpretation Surface ruptures Co-seismic fault Pengguan fault 3-D fault geometry Longmen Shan 7.9 WENCHUAN EARTHQUAKE WESTERN SICHUAN BASIN TIBETAN PLATEAU CHINA RUPTURE
DOI	10.1016/j.tecto.2012.09.018
英文摘要	The 2008 Ms 8.0 Wenchuan earthquake of China ruptured two large faults along the Beichuan-Yingxiu thrust belt and the Pengguan thrust belt at the Longmen Shan Orogenic belt, eastern margin of the Tibetan Plateau. Our study focused on the structural geometry at the Pengguan thrust belt located at the frontal zone of the Central Longmen Shan. In this paper, in order to identify the co-seismic fault at the Pengguan thrust belt many 2-D/3-D seismic reflection profiles have been interpreted by integrating with the geological maps, drilling data, DEM data and the surface ruptures. The results show that there were three major faults and other branch faults at the Pengguan thrust belt. The major faults have formed as imbricates and associated minor duplexes within the shallow strata. The Pengguan fault has a steep dip at the shallow surface and a gentle dip at depth. Both the Beichuan-Yingxiu fault and the Pengguan fault were developed on the shallow detachment in the central segment of Longmen Shan. The third (No. (3)) Pengguan fault is coincident with the co-seismic surface ruptures. It was a pre-existing fault and re-activated during the Wenchuan earthquake. Three-dimensional geometries show that the No. (3) fault is heterogeneous and it has controlled the slip of co-seismic ruptures. Based on the regional geology, the 3-D fault geometry and the surface ruptures, the frontal zone of the Central Longmen Shan has been divided into the Bailu segment and the Hanwang segment. Our studies suggest that the Pengguan fault has been active since the Cenozoic. The frontal zone of the Central Longmen Shan thrust belt has potential for future earthquakes. (C) 2012 Elsevier B.V. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000316974100011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geochemistry & Geophysics; SCI(E); EI; 9; ARTICLE; 178-191; 580
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155673]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Lu, Renqi,He, Dengfa,Suppe, John,et al. Along-strike variation of the frontal zone structural geometry of the Central Longmen Shan thrust belt revealed by seismic reflection profiles[J]. tectonophysics,2012.
APA	Lu, Renqi,He, Dengfa,Suppe, John,Ma, Yongsheng,Liu, Bo,&Chen, Yuegau.(2012).Along-strike variation of the frontal zone structural geometry of the Central Longmen Shan thrust belt revealed by seismic reflection profiles.tectonophysics.
MLA	Lu, Renqi,et al."Along-strike variation of the frontal zone structural geometry of the Central Longmen Shan thrust belt revealed by seismic reflection profiles".tectonophysics (2012).