Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis

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	Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis
	Wang, Z ; Huang, RQ ; Pei, SP
刊名	TECTONOPHYSICS
	2014
卷号	610 页码:128-137
关键词	Crustal deformation Longmen-Shan fault zone Seismogenesis Continental colliding Crustal channel flow
ISSN号	0040-1951
通讯作者	mike-wang@sohu.com
中文摘要	The Longmen-Shan fault zone, at the eastern margin of the Tibetan Plateau, is one of the most extensively studied areas in the world, yet the deformation model and earthquake-generating mechanism remain subjects of vigorous debate. This paper presents a new three-dimensional (3-D) velocity model determined using a large volume of seismic data and two-dimensional (2-D) magnetotelluric (MT) profiles from previous studies, to investigate the mechanisms of crustal deformation and earthquake generation along the reverse-thrust and strike-slip fault zone. It has been observed that low-velocity, and low-resistivity anomalies related to the Sichuan foreland basin, is in sharp contrast to high-velocity and high-resistivity anomalies in the Songpan-Ganze block in the upper crust. The tomographic model presented here reveals two crustal bodies with low-velocity and high-conductivity anomalies underneath the Longmen-Shan fault zone, separated into three contrasting segments by the two crustal bodies. The two low-velocity and low-resistivity bodies have been interpreted as being associated with extrusion of either fluids or products of partial melting from the lower crust and/or the upper mantle. This suggests strong variations in the rheological strength of the rock along the fault zone. This finding implies that coupling between these presumably fluid-bearing bodies and earthquake generation could be extremely complex and that there is dramatic variation from the southwestern area to the northeastern segment along the fault belt It is suggested here that this complex and variable deformation system along the fault zone played a principal role in controlling seismic generation and rupturing during the 2008 Wenchuan earthquake (Ms 8.0) and that it will do so again during possible future earthquakes in the region. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Geochemistry & Geophysics
收录类别	SCI
资助信息	NSFC [41372229, 40974024, 40872148, 40839909]; Chengdu University of Technology; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection; [KYTD201002]; [2010JQ0033]; [201151220007]
原文出处	ELSEVIER SCIENCE BV
WOS记录号	WOS:000331156400009
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10656]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Wang, Z,Huang, RQ,Pei, SP. Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis[J]. TECTONOPHYSICS,2014,610:128-137.
APA	Wang, Z,Huang, RQ,&Pei, SP.(2014).Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis.TECTONOPHYSICS,610,128-137.
MLA	Wang, Z,et al."Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis".TECTONOPHYSICS 610(2014):128-137.