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Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab
Chen, Chuanxu1,2,3; Zhao, Dapeng2; Wu, Shiguo4
2015-04-19
发表期刊TECTONOPHYSICS
ISSN0040-1951
卷号647页码:73-88
摘要We used 40,343 P-wave arrival times from 1883 local earthquakes and 105,455 P-wave arrivals from 6361 teleseismic events to study the detailed structure of the Cascadia subduction zone. We conducted tomographic inversions using a starting velocity model which includes the high-velocity subducting Juan de Fuca slab as a priori information. A number of such slab-constrained inversions are conducted by changing the slab thickness and the velocity contrast between the slab and the surrounding mantle. Our optimal 3-D velocity model fits the data much better than that determined by an inversion with a 1-D homogeneous starting model. Our results show that the subducting Juan de Fuca slab has a thickness of 30-50 km and a P-wave velocity of 1-3% higher than that of the surrounding mantle. Beneath the northern and southern parts of the Cascadia, P-wave velocity is lower in the slab and along the slab interface, which may reflect a more hydrated slab and more active slab dehydration there. The lateral velocity variations may indicate different degrees of slab dehydration and forearc mantle serpentinization. The segmentation in episodic tremor and slip (ETS) is also spatially coincident with the velocity heterogeneities, indicating that the ETS occurrence and recurrence interval are controlled by fluid activity in and around the mantle wedge corner. (C) 2015 Elsevier B.V. All rights reserved.
文章类型Article
关键词Cascadia Juan De Fuca Slab Seismic Tomography Episodic Tremor And Slip Subduction Zone Earthquake
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.tecto.2015.02.012
关键词[WOS]AMBIENT NOISE TOMOGRAPHY ; SURFACE-WAVE DISPERSION ; FORE-ARC MANTLE ; P-WAVE ; NORTHERN CASCADIA ; SEISMIC EVIDENCE ; OCEANIC-CRUST ; AZIMUTHAL ANISOTROPY ; ELECTRICAL STRUCTURE ; EPISODIC TREMOR
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
项目资助者Japan Society for the Promotion of Science(Kiban-S 11050123) ; MEXT(26106005) ; Strategic Priority Research Program of Chinese Academy of Science(XDA11030102) ; National Natural Science Foundation of China(41476046)
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000353087400006
出版者ELSEVIER SCIENCE BV
引用统计
文献类型期刊论文
条目标识符http://ir.qibebt.ac.cn/handle/337004/10430
专题中国科学院青岛生物能源与过程研究所
通讯作者Chen, Chuanxu
作者单位1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
2.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Sanyo Inst Deep Sea Sci & Engn, Sanyo, Peoples R China
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Chen, Chuanxu,Zhao, Dapeng,Wu, Shiguo. Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab[J]. TECTONOPHYSICS,2015,647:73-88.
APA Chen, Chuanxu,Zhao, Dapeng,&Wu, Shiguo.(2015).Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab.TECTONOPHYSICS,647,73-88.
MLA Chen, Chuanxu,et al."Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab".TECTONOPHYSICS 647(2015):73-88.
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