Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab
	Chen, Chuanxu1,2,3 ; Zhao, Dapeng 2; Wu, Shiguo 4
刊名	TECTONOPHYSICS
	2015-04-19
卷号	647 页码:73-88
关键词	Cascadia Juan de Fuca slab Seismic tomography Episodic tremor and slip Subduction zone Earthquake
英文摘要	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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000353087400006
公开日期	2015-06-16
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/25487]
专题	海洋研究所_海洋地质与环境重点实验室
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
推荐引用方式 GB/T 7714	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.