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  1. 防災科研関係論文

Analysis of Orientation Changes of S-Net Accelerometers due to Earthquake Motions

https://nied-repo.bosai.go.jp/records/6436
https://nied-repo.bosai.go.jp/records/6436
d72c9173-5605-43e7-bc9a-346d036362b7
Item type researchmap(1)
公開日 2023-10-09
タイトル
言語 ja
タイトル Analysis of Orientation Changes of S-Net Accelerometers due to Earthquake Motions
タイトル
言語 en
タイトル Analysis of Orientation Changes of S-Net Accelerometers due to Earthquake Motions
言語
言語 eng
著者 Yadab P. Dhakal

× Yadab P. Dhakal

ja Yadab P. Dhakal

en Yadab P. Dhakal

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Takashi Kunugi

× Takashi Kunugi

ja Takashi Kunugi

en Takashi Kunugi

Search repository
抄録
内容記述タイプ Other
内容記述 S-net is a large-scale seafloor observation network for earthquakes and tsunamis around the Japan Trench, consisting of 150 observatories equipped with seismometers and pressure gauges. The sensors have been set up inside cylindrical pressure vessels, which have been buried in the shallow-water regions (water depth &lt;1,500 m), while the vessels have been laid freely on the seafloor in the deeper-water regions. Previous studies showed that the cylindrical pressure vessels rotate during strong shakings due to poor coupling with the seabed sediments, thus making it difficult to retrieve the actual ground motions. We investigated the static changes in the orientations of S-net accelerometers due to shakings from 1,878 earthquakes of Mj greater than 4 that occurred around the network, and found that rotations as large values as 16° were observed during the 2022, Mj 7.4, off-Fukushima Prefecture earthquake. We estimated the threshold acceleration levels after which the sensors are likely to rotate at all S-net stations separately and found that the threshold values lie mostly between 5 and 50 cm/s<sup>2</sup>. Finally, we discussed the observed peak accelerations and velocities at the S-net stations with those recorded on land, where high-quality records were obtained, during the 2022, Mj 7.4 earthquake, which was also the largest magnitude earthquake to occur in the region after the network commenced operation. The results presented herein complement several previous studies and form the basis for more comprehensive future investigations.
言語 en
書誌情報 ja : Journal of Disaster Research
en : Journal of Disaster Research

巻 18, 号 7, p. 730-739, 発行日 2023-10-01
出版者
言語 en
出版者 Fuji Technology Press Ltd.
ISSN
収録物識別子タイプ EISSN
収録物識別子 1883-8030
DOI
関連識別子 10.20965/jdr.2023.p0730
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