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  1. 防災科研関係論文

Estimation of seismic centroid moment tensor using ocean bottom pressure gauges as seismometers

https://nied-repo.bosai.go.jp/records/4047
https://nied-repo.bosai.go.jp/records/4047
3f1b4ad8-8a7f-4f9f-9e89-10fd4c6b6923
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Estimation of seismic centroid moment tensor using ocean bottom pressure gauges as seismometers
タイトル
言語 en
タイトル Estimation of seismic centroid moment tensor using ocean bottom pressure gauges as seismometers
言語
言語 eng
著者 Tatsuya Kubota

× Tatsuya Kubota

ja Tatsuya Kubota

en Tatsuya Kubota

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Tatsuhiko Saito

× Tatsuhiko Saito

ja Tatsuhiko Saito

en Tatsuhiko Saito

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Wataru Suzuki

× Wataru Suzuki

ja Wataru Suzuki

en Wataru Suzuki

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Ryota Hino

× Ryota Hino

ja Ryota Hino

en Ryota Hino

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抄録
内容記述タイプ Other
内容記述 We examined the dynamic pressure change at the seafloor to estimate the centroid moment tensor solutions of the largest and second largest foreshocks (Mw 7.2 and 6.5) of the 2011 Tohoku‐Oki earthquake. Combination of onshore broadband seismograms and high‐frequency (~20–200 s) seafloor pressure records provided the resolution of the horizontal locations of the centroids, consistent with the results of tsunami inversion using the long‐period (≳10 min) seafloor pressure records although the depth was not constrained well, whereas the source locations were poorly constrained by the onshore seismic data alone. Also, the waveforms synthesized from the estimated CMT solution demonstrated the validity of the theoretical relationship between pressure change and vertical acceleration at the seafloor. The results of this study suggest that offshore pressure records can be utilized as offshore seismograms, which would be greatly useful for revealing the source process of offshore earthquakes.
言語 ja
抄録
内容記述タイプ Other
内容記述 We examined the dynamic pressure change at the seafloor to estimate the centroid moment tensor solutions of the largest and second largest foreshocks (Mw 7.2 and 6.5) of the 2011 Tohoku‐Oki earthquake. Combination of onshore broadband seismograms and high‐frequency (~20–200 s) seafloor pressure records provided the resolution of the horizontal locations of the centroids, consistent with the results of tsunami inversion using the long‐period (≳10 min) seafloor pressure records although the depth was not constrained well, whereas the source locations were poorly constrained by the onshore seismic data alone. Also, the waveforms synthesized from the estimated CMT solution demonstrated the validity of the theoretical relationship between pressure change and vertical acceleration at the seafloor. The results of this study suggest that offshore pressure records can be utilized as offshore seismograms, which would be greatly useful for revealing the source process of offshore earthquakes.
言語 en
書誌情報 ja : Geophysical Research Letters
en : Geophysical Research Letters

巻 44, 号 21, p. 10907-10915
出版者
言語 ja
出版者 American Geophysical Union
出版者
言語 en
出版者 American Geophysical Union
DOI
関連識別子 10.1002/2017GL075386
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