气候变化领域集成服务门户(CCPortal): Seismic imaging, crustal stress and GPS data analyses: Implications for the generation of the 2008 Wenchuan Earthquake (M7.9), China

CCPortal

DOI	10.1016/j.gr.2010.05.004
	Seismic imaging, crustal stress and GPS data analyses: Implications for the generation of the 2008 Wenchuan Earthquake (M7.9), China
	Wang, Zhi; Wang, Jian; Chen, Zhiliang; Liu, Yuping; Huang, Runqiu; Pei, Shunping; Zhang, Qingzhi; Tang, Wenqing
通讯作者	Wang, Z (通讯作者)
发表日期	2011
ISSN	1342-937X
EISSN	1878-0571
起始页码	202
结束页码	212
卷号	19 期号:1
英文摘要	Seismic imaging together with global positioning system (GPS) and crustal stress data analyses show that the Mw7.9 2008 Wenchuan earthquake occurred within a distinct area of high crustal stress (similar to 17.5 MPa) and high Poisson's ratio (7-10%) anomalies centered on the Longmen-Shan (Shan means Mountain in Chinese) tectonic fault belt. Low P-wave and S-wave velocities in the southwest (SW) segment contrast with high-velocity anomalies in the central portion (CP) and northeast (NE) segment within the uppermost similar to 15 km depths along the tectonic fault belt, though a presumably ductile zone with low-velocity anomalies separates the CP and NE segment. The rupture initiated near the southwestern end of the CP at a zone of high Poisson's ratio (a) which extends down into the lower crust. These low-velocity and high-a anomalies immediately below the source hypocenter, together with the high crustal stress, indicate the presence of high-pressure fluids from the lower crust, which might have reduced the mechanical strength of the fractured rock matrix and triggered the earthquake. Our study suggests that the structural heterogeneity and high crustal stress played an important role in the nucleation of the Wenchuan earthquake and its rupture process. Crown Copyright (C) 2010 Published by Elsevier B.V, on behalf of International Association for Gondwana Research. All rights reserved.
关键词	UPPER-MANTLE PREFECTURE EARTHQUAKE VELOCITY STRUCTURE TIBETAN PLATEAU EASTERN MARGIN SOURCE AREA FLUIDS FLOW TOMOGRAPHY EVOLUTION
英文关键词	Structural heterogeneity; Crustal stress; Global positioning system; 2008 Wenchuan earthquake
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000286960100016
来源期刊	GONDWANA RESEARCH
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/257888
推荐引用方式 GB/T 7714	Wang, Zhi,Wang, Jian,Chen, Zhiliang,et al. Seismic imaging, crustal stress and GPS data analyses: Implications for the generation of the 2008 Wenchuan Earthquake (M7.9), China[J]. 中国科学院青藏高原研究所,2011,19(1).
APA	Wang, Zhi.,Wang, Jian.,Chen, Zhiliang.,Liu, Yuping.,Huang, Runqiu.,...&Tang, Wenqing.(2011).Seismic imaging, crustal stress and GPS data analyses: Implications for the generation of the 2008 Wenchuan Earthquake (M7.9), China.GONDWANA RESEARCH,19(1).
MLA	Wang, Zhi,et al."Seismic imaging, crustal stress and GPS data analyses: Implications for the generation of the 2008 Wenchuan Earthquake (M7.9), China".GONDWANA RESEARCH 19.1(2011).