Seismic anisotropy and geodynamics of the East Japan subduction zone
文献类型：期刊论文
| 作者 | Zhao, Dapeng5; Wang, Jian4; Huang, Zhouchuan3; Liu, Xin2; Wang, Zewei1 |
| 刊名 | JOURNAL OF GEODYNAMICS
 |
| 出版日期 | 2023-06-01 |
| 卷号 | 156页码:17 |
| 关键词 | Subduction zone Seismic anisotropy Seismic tomography Subducting slab Earthquake Mantle wedge Forearc Back-arc |
| ISSN号 | 0264-3707 |
| DOI | 10.1016/j.jog.2023.101975 |
| 英文摘要 | Seismic anisotropy in the East Japan arc has been extensively investigated by conducting shear-wave splitting measurements, receiver-function analyses, and tomographic inversions of body-wave travel times and surface-wave dispersion data, which have provided a wealth of information on dynamic processes associated with active subduction of the Pacific plate. Measuring shear-wave splitting is popular and effective to detect seismic anisotropy, but it has poor depth resolution. This problem has been overcome by conducting 3-D anisotropic tomography, which has high-resolution in both lateral and vertical directions. Both P and S wave anisotropies are revealed in the crust, which are caused by alignment or preferred orientation of crustal minerals and stress-induced microcracks related to active faults. Trench-normal fast-velocity directions (FVDs) of azimuthal anisotropy are revealed in the back-arc mantle wedge, reflecting subduction-driven convection there. Trench-parallel FVDs appear in the forearc mantle wedge under the land area, which may reflect deformation that results in B-type olivine fabric. The forearc mantle wedge offshore may lack anisotropy, suggesting that it is stagnant and decoupled from the subducting slab and does not participate in the viscous flow, in sharp contrast with the rest of the mantle wedge. The most significant findings of the body-wave anisotropic tomography are its constraints on the slab anisotropy. The subducting Pacific slab exhibits mainly trench-parallel FVDs, which reflect shape-preferred orientation of crystals and cracks related to normal faults produced in the outer-rise area before the plate subduction, overprinting the fossil anisotropy that the Pacific plate gained when it was produced at the mid-ocean ridge. Trench-parallel intraslab fast velocity planes of anisotropy intersect the slab upper surface at high angles (similar to 45-90 degrees), reflecting aligned hydrated faults in the slab. Ruptures of the hydrated faults in the upper part of the slab may cause large intraslab earthquakes (M >= 7.0) that take place frequently beneath the forearc area. Trench-normal FVDs also appear in the subslab mantle, which may reflect asthenospheric shear deformation associated with the overlying slab subduction. |
| WOS关键词 | WAVE POLARIZATION ANISOTROPY ; ATTENUATION STRUCTURE BENEATH ; TOMOGRAPHY CODE ANITOMO ; SP DEPTH-PHASE ; UPPER-MANTLE ; P-WAVE ; AZIMUTHAL ANISOTROPY ; S-WAVE ; CRUSTAL ANISOTROPY ; RECEIVER FUNCTIONS |
| 资助项目 | JapanSociety for the Promotion of Science[19H01996] ; National Natural Science Foundation of China[91958209] ; National Natural Science Foundation of China[42174056] ; National Natural Science Foundation of China[41972211] ; National Natural Science Foundation of China[42274058] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001011030000001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | JapanSociety for the Promotion of Science ; JapanSociety for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; JapanSociety for the Promotion of Science ; JapanSociety for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; JapanSociety for the Promotion of Science ; JapanSociety for the Promotion of Science ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; JapanSociety for the Promotion of Science ; JapanSociety 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/132A11/111275]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Zhao, Dapeng |
| 作者单位 | 1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China 2.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China 3.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 5.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai 9808578, Japan |
| 推荐引用方式 GB/T 7714 | Zhao, Dapeng,Wang, Jian,Huang, Zhouchuan,et al. Seismic anisotropy and geodynamics of the East Japan subduction zone[J]. JOURNAL OF GEODYNAMICS,2023,156:17. |
| APA | Zhao, Dapeng,Wang, Jian,Huang, Zhouchuan,Liu, Xin,&Wang, Zewei.(2023).Seismic anisotropy and geodynamics of the East Japan subduction zone.JOURNAL OF GEODYNAMICS,156,17. |
| MLA | Zhao, Dapeng,et al."Seismic anisotropy and geodynamics of the East Japan subduction zone".JOURNAL OF GEODYNAMICS 156(2023):17. |
入库方式： OAI收割
来源：地质与地球物理研究所
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