| Tomographic imaging of the Cascadia subduction zone: Constraints on the Juan de Fuca slab | |
Chen, Chuanxu1,2,3 ; Zhao, Dapeng2; Wu, Shiguo4
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| 2015-04-19 | |
| 发表期刊 | TECTONOPHYSICS
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| 卷号 | 647页码:73-88 |
| 文章类型 | Article |
| 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. |
| 关键词 | Cascadia Juan De Fuca Slab Seismic Tomography Episodic Tremor And Slip Subduction Zone Earthquake |
| DOI | 10.1016/j.tecto.2015.02.012 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000353087400006 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/25487 |
| 专题 | 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 |
| 第一作者单位 | 中国科学院海洋研究所 |
| 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. |
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| Tomographic imaging （6697KB） | 期刊论文 | 出版稿 | 限制开放 | ODC PDDL | 浏览 | |
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