Deep ruptures around the hypocenter of the 12 May 2008 Wenchuan earthquake deduced from aftershock observations

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	Deep ruptures around the hypocenter of the 12 May 2008 Wenchuan earthquake deduced from aftershock observations
	An, MJ (An, Meijian); Feng, M (Feng, Mei); Long, CX (Long, Changxing)
刊名	TECTONOPHYSICS
	2010
卷号	491 期号:1-4 特刊 SI 页码:96-104
关键词	Wenchuan earthquake Aftershock Rupture Relative relocation
ISSN号	0040-1951
英文摘要	On 12 May 2008, a great earthquake of Mw 7.9 occurred in Wenchuan, China. To record its aftershocks and investigate the distribution of deep ruptures associated with the event, we deployed a temporary short-period seismic network around the epicenter soon after the earthquake had occurred. A total of 6036 aftershocks were located from 108 days of seismic data with a high signal-to-noise ratio, collected from July to October 2008. These aftershocks were further processed using a double-differential location method, and 2878 aftershocks were retained in the relocated clusters. According to the distribution of aftershocks, we refined the location of the main shock hypocenter to 31.001 degrees N, 103.280 degrees E, 17 km deep. The spatial distribution of aftershocks reveals interesting features of the deep ruptures (1) most aftershocks are located in the upper crust at depths shallower than 20 km, beneath surface outcrop of the Pengguan massif, indicating that the upper crust is brittle and seismogenic and that the brittle-ductile transition is located at the transition between the middle and upper crust; (2) a NW-SE-striking low-seismicity zone crossing through Yingxiu Town divides the study area into two blocks with contrasting distributions of deep seismicity, suggesting different rupture characteristics either side of the line; and (3) upward extrapolation of aftershock clusters intersects with the southern and northern arms of the Zipingpu Reservoir, indicating that aftershocks and future seismicity along the ruptures around the reservoir that were activated by the Wenchuan earthquake will be influenced by reservoir impoundment/drainage for several decades to come. (C) 2010 Elsevier B.V. All rights reserved.
学科主题	地震地质学
WOS关键词	RELOCATION ; FAULT ; SEQUENCE ; GEOMETRY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000281943600008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39218]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	An, MJ ,Feng, M ,Long, CX . Deep ruptures around the hypocenter of the 12 May 2008 Wenchuan earthquake deduced from aftershock observations[J]. TECTONOPHYSICS,2010,491(1-4 特刊 SI):96-104.
APA	An, MJ ,Feng, M ,&Long, CX .(2010).Deep ruptures around the hypocenter of the 12 May 2008 Wenchuan earthquake deduced from aftershock observations.TECTONOPHYSICS,491(1-4 特刊 SI),96-104.
MLA	An, MJ ,et al."Deep ruptures around the hypocenter of the 12 May 2008 Wenchuan earthquake deduced from aftershock observations".TECTONOPHYSICS 491.1-4 特刊 SI(2010):96-104.