气候变化领域集成服务门户(CCPortal): Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis

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DOI	10.1016/j.tecto.2013.11.004
	Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis
	Wang, Zhi; Huang, Runqiu; Pei, Shunping
通讯作者	Wang, Z (通讯作者)
发表日期	2014
ISSN	0040-1951
EISSN	1879-3266
起始页码	128
结束页码	137
卷号	610
英文摘要	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.
关键词	2008 WENCHUAN EARTHQUAKE TIBETAN PLATEAU VELOCITY STRUCTURE UPPER-MANTLE SOURCE AREA BENEATH CHINA FLOW MELT CONSTRAINTS
英文关键词	Crustal deformation; Longmen-Shan fault zone; Seismogenesis; Continental colliding; Crustal channel flow
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000331156400009
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258294
推荐引用方式 GB/T 7714	Wang, Zhi,Huang, Runqiu,Pei, Shunping. Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis[J]. 中国科学院青藏高原研究所,2014,610.
APA	Wang, Zhi,Huang, Runqiu,&Pei, Shunping.(2014).Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis.TECTONOPHYSICS,610.
MLA	Wang, Zhi,et al."Crustal deformation along the Longmen-Shan fault zone and its implications for seismogenesis".TECTONOPHYSICS 610(2014).