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  1. 防災科研関係論文

Was the 2011 Tohoku-Oki earthquake preceded by aseismic preslip? Examination of seafloor vertical deformation data near the epicenter

https://nied-repo.bosai.go.jp/records/4199
https://nied-repo.bosai.go.jp/records/4199
bd6ddb0f-96b0-480c-a7df-072e98c3ee50
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Was the 2011 Tohoku-Oki earthquake preceded by aseismic preslip? Examination of seafloor vertical deformation data near the epicenter
言語
言語 eng
著者 R. Hino

× R. Hino

en R. Hino

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D. Inazu

× D. Inazu

en D. Inazu

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Y. Ohta

× Y. Ohta

en Y. Ohta

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Y. Ito

× Y. Ito

en Y. Ito

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S. Suzuki

× S. Suzuki

en S. Suzuki

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T. Iinuma

× T. Iinuma

en T. Iinuma

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Y. Osada

× Y. Osada

en Y. Osada

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M. Kido

× M. Kido

en M. Kido

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H. Fujimoto

× H. Fujimoto

en H. Fujimoto

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Y. Kaneda

× Y. Kaneda

en Y. Kaneda

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抄録
内容記述タイプ Other
内容記述 Ocean-bottom pressure records obtained near the epicenter of the 2011 Tohoku-Oki earthquake were examined to test whether the earthquake was preceded by substantial precursory crustal deformation. The seafloor data enabled us to search for small-scale preslip near the epicenter that would be difficult to identify from terrestrial geodetic data. After treating the data to reduce nontectonic fluctuations, we obtained a time series of seafloor vertical deformation in the epicentral region with a noise level of 2-4 cm. No significant crustal deformation related to preslip was detected in the period of roughly a day before the mainshock, whereas postseismic deformation associated with the largest foreshock 2 days before the mainshock was apparent. From our quantitative estimate of the sensitivity of the seafloor network in detecting slip on the plate interface, we conclude that the Tohoku-Oki earthquake was not preceded by preslip with moment release greater than moment magnitude (Mw) 6.2 in the vicinity of the hypocenter or greater than Mw 6.0 along the subduction interface near the trench.
言語 en
書誌情報 en : MARINE GEOPHYSICAL RESEARCH

巻 35, 号 3, p. 181-190
出版者
言語 en
出版者 SPRINGER
ISSN
収録物識別子タイプ EISSN
収録物識別子 1573-0581
DOI
関連識別子 10.1007/s11001-013-9208-2
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