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  1. 防災科研関係論文

Deep slab dehydration and large-scale upwelling flow in the upper mantle beneath the Japan Sea

https://nied-repo.bosai.go.jp/records/2713
https://nied-repo.bosai.go.jp/records/2713
8538d5d4-f980-4d0f-b6e0-5f4e42da1700
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Deep slab dehydration and large-scale upwelling flow in the upper mantle beneath the Japan Sea
タイトル
言語 en
タイトル Deep slab dehydration and large-scale upwelling flow in the upper mantle beneath the Japan Sea
言語
言語 eng
著者 Kazuo Nakahigashi

× Kazuo Nakahigashi

ja Kazuo Nakahigashi

en Kazuo Nakahigashi

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Masanao Shinohara

× Masanao Shinohara

ja Masanao Shinohara

en Masanao Shinohara

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Tomoaki Yamada

× Tomoaki Yamada

ja Tomoaki Yamada

en Tomoaki Yamada

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Kenji Uehira

× Kenji Uehira

ja Kenji Uehira

en Kenji Uehira

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Shinichi Sakai

× Shinichi Sakai

ja Shinichi Sakai

en Shinichi Sakai

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Kimihiro Mochizuki

× Kimihiro Mochizuki

ja Kimihiro Mochizuki

en Kimihiro Mochizuki

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Hajime Shiobara

× Hajime Shiobara

ja Hajime Shiobara

en Hajime Shiobara

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Toshihiko Kanazawa

× Toshihiko Kanazawa

ja Toshihiko Kanazawa

en Toshihiko Kanazawa

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抄録
内容記述タイプ Other
内容記述 We present a three-dimensional P and S wave tomography model beneath the central Japan Sea using arrival time data obtained by long-term ocean bottom seismometer observations. The tomographic model is determined down to over 300 km. The resulting tomographic image has two features in the mantle wedge. First, a remarkable low-velocity region is spread within the shallow part of the mantle wedge beneath the Japan arc with a slight extension beneath the Japan Sea. Second, an inclined low-velocity anomaly exists in the deeper part beneath the Japan Sea and converges to the slab at ~300 km depth. Moreover, its anomaly amplitude is distinctly small compared to the shallow part of the low-velocity region. These low-velocity anomalies are interpreted to represent fluids that were dehydrated from the Pacific and Philippine Sea slabs and melt production affected by the fluid. Our observations suggest that the deep dehydration from the Pacific slab is found at a depth of approximately 300 km and large-scale upwelling flow mechanically induced by plate subduction exists beneath the Japan Sea. Our results indicate the importance of the deep heterogeneous mantle wedge structure beneath the Japan Sea with regards to better understanding the magmatism of the subduction dynamics in Japan and the evolution of the opening of the Japan Sea
言語 en
書誌情報 ja : Journal of Geophysical Research: Solid Earth
en : Journal of Geophysical Research: Solid Earth

巻 120, 号 5, p. 3278-3292, 発行日 2015-05
出版者
言語 en
出版者 American Geophysical Union (AGU)
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1002/2014jb011781
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