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学科主题: Geochemistry & Geophysics
题名: Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis
作者: Wang, Z ; Huang, RQ ; Pei, SP
通讯作者: mike-wang@sohu.com
关键词: Crustal deformation ; Longmen-Shan fault zone ; Seismogenesis ; Continental colliding ; Crustal channel flow
刊名: TECTONOPHYSICS
发表日期: 2014
卷: 610, 页:128-137
收录类别: sci
部门归属: [Wang, Zhi] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Huang, Runqiu] Chengdu Univ Technol, Key Lab Geohazard Prevent & Geoenvironm Protect, Chengdu 610059, Peoples R China ; [Pei, Shunping] Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
项目归属: 海洋地质
资助者: NSFC [41372229, 40974024, 40872148, 40839909]; Chengdu University of Technology; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection; [KYTD201002]; [2010JQ0033]; [201151220007]
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.
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WOS记录号: WOS:000331156400009
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10656
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wang, Z; Huang, RQ; Pei, SP.Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis,TECTONOPHYSICS,2014,610():128-137
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