Seismogenic Structure around the Epicenter of the May 12, 2008 Wenchuan Earthquake from Micro-seismic Tomography

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	Seismogenic Structure around the Epicenter of the May 12, 2008 Wenchuan Earthquake from Micro-seismic Tomography
	An, MJ (An Meijian); Feng, M (Feng Mei); Dong, SW (Dong Shuwen); Long, CX (Long Changxing); Zhao, Y (Zhao Yue); Yang, N (Yang Nong); Zhao, WJ (Zhao Wenjin); Zhang, JZ (Zhang Jizhong)
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2009
卷号	83 期号:4 页码:724-732
关键词	Wenchuan earthquake seismogenic structure micro-seismic tomography Pengguan massif Longmen Shan fault zone
ISSN号	1000-9515
英文摘要	A three-dimensional local-scale P-velocity model down to 25 km depth around the main shock epicenter region was constructed using 83821 event-to-receiver seismic rays from 5856 aftershocks recorded by a newly deployed temporary seismic network. Checkerboard tests show that our tomographic model has lateral and vertical resolution of similar to 2 km. The high-resolution P-velocity model revealed interesting structures in the seismogenic layer (1) The Guanxian-Anxian fault, Yingxiu-Beichuan fault and Wenchuan-Maoxian fault of the Longmen Shan fault zone are well delineated by sharp upper crustal velocity changes; (2) The Pengguan massif has generally higher velocity than its surrounding areas, and may extend down to at least similar to 10 km from the surface; (3) A sharp lateral velocity variation beneath the Wenchuan-Maoxian fault may indicate that the Pengguan massif's western boundary and/or the Wenchuan-Maoxian fault is vertical, and the hypocenter of the Wenchuan earthquake possibly located at the conjunction point of the NW dipping Yingxiu-Beichuan and Guanxian-Anxian faults, and vertical Wenchuan-Maoxian fault; (4) Vicinity along the Yingxiu-Beichuan fault is characterized by very low velocity and low seismicity at shallow depths, possibly due to high content of porosity and fractures; (5) Two blocks of low-velocity anomaly are respectively imaged in the hanging wall and foot wall of the Guanxian-Anxian fault with a similar to 7 km offset with similar to 5 km vertical component.
学科主题	地震地质学
WOS关键词	TRAVEL-TIME TOMOGRAPHY ; FINITE-DIFFERENCE CALCULATION ; SPARSE LINEAR-EQUATIONS ; TIBETAN PLATEAU ; P-WAVE ; EASTERN MARGIN ; LEAST-SQUARES ; UPPER-MANTLE ; BENEATH ; CRUST
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000268027700005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39063]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	An, MJ ,Feng, M ,Dong, SW ,et al. Seismogenic Structure around the Epicenter of the May 12, 2008 Wenchuan Earthquake from Micro-seismic Tomography[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2009,83(4):724-732.
APA	An, MJ .,Feng, M .,Dong, SW .,Long, CX .,Zhao, Y .,...&Zhang, JZ .(2009).Seismogenic Structure around the Epicenter of the May 12, 2008 Wenchuan Earthquake from Micro-seismic Tomography.ACTA GEOLOGICA SINICA-ENGLISH EDITION,83(4),724-732.
MLA	An, MJ ,et al."Seismogenic Structure around the Epicenter of the May 12, 2008 Wenchuan Earthquake from Micro-seismic Tomography".ACTA GEOLOGICA SINICA-ENGLISH EDITION 83.4(2009):724-732.