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  1. 防災科研関係論文

Strong Motions on Land and Ocean Bottom: Comparison of Horizontal PGA, PGV, and 5% Damped Acceleration Response Spectra in Northeast Japan and the Japan Trench Area

https://nied-repo.bosai.go.jp/records/3392
https://nied-repo.bosai.go.jp/records/3392
b82bc14b-f822-4c1c-8f0e-32a6131a1c3a
Item type researchmap(1)
公開日 2024-04-29
タイトル
言語 en
タイトル Strong Motions on Land and Ocean Bottom: Comparison of Horizontal PGA, PGV, and 5% Damped Acceleration Response Spectra in Northeast Japan and the Japan Trench Area
著者 Yadab P. Dhakal

× Yadab P. Dhakal

en Yadab P. Dhakal

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Takashi Kunugi

× Takashi Kunugi

en Takashi Kunugi

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Wataru Suzuki

× Wataru Suzuki

en Wataru Suzuki

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Takeshi Kimura

× Takeshi Kimura

en Takeshi Kimura

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Nobuyuki Morikawa

× Nobuyuki Morikawa

en Nobuyuki Morikawa

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Shin Aoi

× Shin Aoi

en Shin Aoi

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抄録
内容記述タイプ Other
内容記述 ABSTRACT A large-scale permanent ocean-bottom seismograph network, named S-net, has been established in the Japan Trench area and consists of 150 observatories equipped with seismometers and tsunamimeters. Most stations at water depths <1500 m were buried to a depth of about 1 m while they were sited freely on the seafloors at greater water depths. To understand the characteristics of strong ground motions on the offshore area, we compared the horizontal vector peak ground accelerations (PGA), peak ground velocities (PGVs), and acceleration response spectra (ARS) between the land and S-net sites for nine earthquakes (5.3≤Mw≤7.1) using ground-motion prediction equations developed for Japan. We found that the observed values of PGAs and short-period (<0.5 s) ARS were generally similar between the land and S-net sites, whereas the PGVs and ARS for the periods longer than 0.5 s were apparently larger at the S-net sites. These results based on data covering a wide area on the seafloors were generally similar to the previous results based on limited ocean-bottom stations. However, analysis of the residuals, within the source-to-site distance of 200 km, revealed that the residual values were smaller in the shallow water region compared to those toward the Japan Trench, which is characterized by proximity to high Qs in the Pacific plate, the presence of thick unconsolidated sediments on the upper crust, and increasing heights of water columns. The difference of station settings in the shallow and deep water regions may also have contributed to the biased distribution of residuals at the short periods. Quantifications of these results are expected to contribute to the predictions of ground motions for earthquake early warning and seismic demand analysis of offshore facilities and await further analysis of a larger data set.
言語 en
書誌情報 en : Bulletin of the Seismological Society of America

発行日 2021-06-22
出版者
言語 en
出版者 Seismological Society of America (SSA)
ISSN
収録物識別子タイプ EISSN
収録物識別子 1943-3573
DOI
関連識別子 10.1785/0120200368
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