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Stagnant forearc mantle wedge inferred from mapping of shear-wave anisotropy using S-net seafloor seismometers
https://nied-repo.bosai.go.jp/records/4624
https://nied-repo.bosai.go.jp/records/4624899c4f36-4011-47ce-97af-29c7de0e129b
| Item type | researchmap(1) | |||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| タイトル | Stagnant forearc mantle wedge inferred from mapping of shear-wave anisotropy using S-net seafloor seismometers | |||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||||||
| 著者 |
Naoki Uchida
× Naoki Uchida
× Junichi Nakajima
× Kelin Wang
× Ryota Takagi
× Keisuke Yoshida
× Takashi Nakayama
× Ryota Hino
× Tomomi Okada
× Youichi Asano
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| 抄録 | ||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||
| 内容記述 | Shear-wave anisotropy in Earth’s mantle helps constrain the lattice-preferred orientation of anisotropic minerals due to viscous flow. Previous studies at the Japan Trench subduction zone using land-based seismic networks identified strong anisotropy in the mantle wedge, reflecting viscous flow induced by the subducting slab. Here we map anisotropy in the previously uninvestigated offshore region by analyzing shear waves from interplate earthquakes that are recorded by a new seafloor network (the S-net). The newly detected anisotropy is not in the mantle wedge but only in the overlying crust (?0.1 s time delay and trench-parallel fast direction). The distinct lack of anisotropy indicates that the forearc mantle wedge offshore is decoupled from the slab and does not participate in the viscous flow, in sharp contrast with the rest of the mantle wedge. A stagnant forearc mantle wedge provides a stable and cold tectonic environment that is important for the petrological evolution and earthquake processes of subduction zones. | |||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| 書誌情報 |
en : Nature Communications 巻 11, 号 1, 発行日 2020-12 |
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| 出版者 | ||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| 出版者 | NATURE RESEARCH | |||||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||
| 収録物識別子 | 2041-1723 | |||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||
| 関連識別子 | 10.1038/s41467-020-19541-y | |||||||||||||||||||||||
