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  1. 防災科研関係論文

A weak subducting slab at intermediate depths below northeast Japan

https://nied-repo.bosai.go.jp/records/6554
https://nied-repo.bosai.go.jp/records/6554
de7e1d99-f14a-4480-98b1-3a51d0d031df
Item type researchmap(1)
公開日 2024-05-06
タイトル
言語 en
タイトル A weak subducting slab at intermediate depths below northeast Japan
言語
言語 eng
著者 Brent G. Delbridge

× Brent G. Delbridge

en Brent G. Delbridge

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Heidi Houston

× Heidi Houston

en Heidi Houston

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Roland Bürgmann

× Roland Bürgmann

en Roland Bürgmann

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Saeko Kita

× Saeko Kita

en Saeko Kita

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Youichi Asano

× Youichi Asano

en Youichi Asano

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抄録
内容記述タイプ Other
内容記述 Knowledge of the state of stress in subducting slabs is essential for understanding their mechanical behavior and the physical processes that generate earthquakes. Here, we develop a framework which uses a high-resolution focal mechanism catalog to determine the change in the position of the neutral plane before and after the M9 Tohoku-oki earthquake to determine that the deviatoric stress within the slab at intermediate depths must be very low (∼1 MPa). We show that by combining the static stress calculated from coseismic slip distributions with the stress orientations before and after the mainshock, we can determine the full deviatoric stress tensor within the subducting slab at intermediate depths. These results preclude earthquake source mechanisms that require large background driving stresses, favoring a mechanically weak subducting slab, thus providing quantitative constraints on the physical processes that generate intermediate-depth earthquakes.
言語 en
書誌情報 en : Science Advances

巻 10, 号 9, 発行日 2024-03
出版者
言語 en
出版者 American Association for the Advancement of Science (AAAS)
ISSN
収録物識別子タイプ EISSN
収録物識別子 2375-2548
DOI
関連識別子 10.1126/sciadv.adh2106
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