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DOI	10.1016/j.tecto.2011.12.032
	Mapping the Tohoku forearc: Implications for the mechanism of the 2011 East Japan earthquake (Mw 9.0)
	Wang, Zhi; Huang, Wenli; Zhao, Dapeng; Pei, Shunping
通讯作者	Wang, Z (通讯作者)
发表日期	2012
ISSN	0040-1951
EISSN	1879-3266
起始页码	147
结束页码	154
卷号	524
英文摘要	To investigate the generation mechanism of the 2011 great East Japan (GEJ) earthquake (M 9.0), we determined a three-dimensional (3-D) seismic model under the NE Japan forearc region using a large number of P and S wave arrival times from local earthquakes. Our results show that the GEJ main-shock occurred in a high-velocity (Vp. Vs) zone with higher Poisson's ratio (sigma). The aftershocks relocated with a master-event location (MEL) procedure indicate that most of them are located at the corner of the mantle wedge along the upper boundary of the subducting Pacific slab, and their focal depths are slightly shallower than the background seismicity. The tomographic images and spatial distribution of the aftershocks imply strong interplate coupling (asperity) in the main-shock area and weak coupling in the surrounding areas of the megathrust zone. We think that fluids in the crust and uppermost mantle in the subduction zone could have affected the earthquake generation through the physical role of fluid pressure and a variety of chemical effects. We conclude that the 2011 GEJ earthquake initiation and the rupture processes of the aftershock sequence were influenced by fluid extrusion into the rupture zone due to the dehydration of the subducting Pacific slab. Fluid-bearing structural heterogeneities with thermal petrologic variations in the megathrust zone played a key role in the initiation of the 2011 GEJ earthquake and its aftershocks. (C) 2011 Elsevier B.V. All rights reserved.
关键词	NORTHEASTERN JAPAN MANTLE WEDGE STRUCTURE BENEATH P-WAVE SEISMOLOGICAL EVIDENCE SEISMIC STRUCTURE S-WAVE SERPENTINIZATION VELOCITY FLUIDS
英文关键词	2011 great east Japan earthquake; Interplate coupling; Slab hydration; Forearc mantle wedge
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000301470900012
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/258060
推荐引用方式 GB/T 7714	Wang, Zhi,Huang, Wenli,Zhao, Dapeng,et al. Mapping the Tohoku forearc: Implications for the mechanism of the 2011 East Japan earthquake (Mw 9.0)[J]. 中国科学院青藏高原研究所,2012,524.
APA	Wang, Zhi,Huang, Wenli,Zhao, Dapeng,&Pei, Shunping.(2012).Mapping the Tohoku forearc: Implications for the mechanism of the 2011 East Japan earthquake (Mw 9.0).TECTONOPHYSICS,524.
MLA	Wang, Zhi,et al."Mapping the Tohoku forearc: Implications for the mechanism of the 2011 East Japan earthquake (Mw 9.0)".TECTONOPHYSICS 524(2012).