Seismic structure and subduction dynamics of the western Japan arc
文献类型：期刊论文
| 作者 | Zhao, Dapeng3; Wang, Jian4; Huang, Zhouchuan1; Liu, Xin2 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2021-03-05 |
| 卷号 | 802页码:17 |
| ISSN号 | 0040-1951 |
| 关键词 | Pacific plate Philippine Sea plate Subduction Volcano Earthquake Japan Islands |
| DOI | 10.1016/j.tecto.2021.228743 |
| 英文摘要 | Recent findings on the seismic structure and subduction dynamics of the western Japan arc are reviewed. High-resolution seismic velocity and attenuation tomography has imaged the subducting Pacific and Philippine Sea (PHS) slabs clearly. Low-velocity (low-V) and high-attenuation (low-Q) anomalies are revealed in the crust and mantle wedge beneath the volcanic front and back-arc areas, which reflect arc magmas produced by corner flow in the mantle wedge and slab dehydration. Low-V and low-Q zones in the forearc mantle wedge reflect mantle serpentinization due to abundant fluids from the young and warm PHS slab. Low-V anomalies appear below the PHS slab, which reflect upwelling flow in the big mantle wedge above the Pacific slab and may heat the PHS slab from below, causing aseismic PHS slab at depths >100 km under Shikoku and Chugoku. Results of anisotropic tomography show that the Pacific and PHS slabs exhibit mainly trench-parallel fast-velocity directions (FVDs), which may reflect lattice-preferred orientation of anisotropic minerals as well as shape-preferred orientation of steep normal faults produced at the outer-rise area near the trench axis. Trench-normal FVDs are generally revealed in the back-arc mantle wedge and subslab asthenosphere, reflecting mantle flows entrained by the plate subductions. Large megathrust earthquakes nucleated in or around patches with high-V, high-Q and low Poisson's ratio along the slab interface, which may represent strongly coupled areas in the megathrust zone, suggesting that structural heterogeneities in the megathrust zone, such as the subducting seafloor topography and compositional variations, control the nucleation of megathrust earthquakes. The PHS slab has subducted aseismically down to similar to 450 km depth. The lithospheric age of the PHS slab ranges from 15 to 43 Myr in western Japan. The Beppu-Shimabara graben was produced by joint effects of northward extension of the opening Okinawa Trough, westward extension of the Median Tectonic Line, and hot and wet upwelling flow in the mantle wedge. The generation of large crustal earthquakes is affected by structural heterogeneities in the crust and upper mantle, in particular, arc magma and fluids. Future advances of seismic imaging mainly depend on the progress in seismic instrumentation. Gradual deployment of seismometers on seafloor will be the most important task for seismologists from now |
| WOS关键词 | PHILIPPINE SEA SLAB ; ATTENUATION STRUCTURE BENEATH ; WAVE POLARIZATION ANISOTROPY ; KANTO-TOKAI DISTRICT ; STRIKE-SLIP-FAULT ; SOUTHWEST JAPAN ; P-WAVE ; NANKAI TROUGH ; MANTLE WEDGE ; AZIMUTHAL ANISOTROPY |
| 资助项目 | Japan Society for the Promotion of Science[19H01996] ; National Natural Science Foundation of China[91958209] ; National Natural Science Foundation of China[41674044] ; National Natural Science Foundation of China[41972211] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000674642400003 |
| 资助机构 | Japan Society for the Promotion of Science ; Japan Society for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Japan Society for the Promotion of Science ; Japan Society for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Japan Society for the Promotion of Science ; Japan Society for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Japan Society for the Promotion of Science ; Japan Society for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101941]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Zhao, Dapeng |
| 作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China 2.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China 3.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Miyagi 9808578, Japan 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Dapeng,Wang, Jian,Huang, Zhouchuan,et al. Seismic structure and subduction dynamics of the western Japan arc[J]. TECTONOPHYSICS,2021,802:17. |
| APA | Zhao, Dapeng,Wang, Jian,Huang, Zhouchuan,&Liu, Xin.(2021).Seismic structure and subduction dynamics of the western Japan arc.TECTONOPHYSICS,802,17. |
| MLA | Zhao, Dapeng,et al."Seismic structure and subduction dynamics of the western Japan arc".TECTONOPHYSICS 802(2021):17. |
入库方式： OAI收割
来源：地质与地球物理研究所
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