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https://hdl.handle.net/20.500.14094/90004864
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2024-04-25
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90004864 (fulltext)
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メタデータID
90004864
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open access
出版タイプ
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タイトル
Mechanism of the 2015 volcanic tsunami earthquake near Torishima, Japan
著者
Fukao, Yoshio ; Sandanbata, Osamu ; Sugioka, Hiroko ; Ito, Aki ; Shiobara, Hajime ; Watada, Shingo ; Satake, Kenji
著者名
Fukao, Yoshio
著者名
Sandanbata, Osamu
著者ID
A0743
研究者ID
1000000359184
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=1b8c37d273204c78520e17560c007669
著者名
Sugioka, Hiroko
杉岡, 裕子
スギオカ, ヒロコ
所属機関名
理学研究科
著者名
Ito, Aki
著者名
Shiobara, Hajime
著者名
Watada, Shingo
著者名
Satake, Kenji
収録物名
Science Advances
巻(号)
4(4)
ページ
eaao0219-eaao0219
出版者
American Association for the Advancement of Science
刊行日
2018-04-04
公開日
2018-05-16
抄録
Tsunami earthquakes are a group of enigmatic earthquakes generating disproportionally large tsunamis relative to seismic magnitude. These events occur most typically near deep-sea trenches. Tsunami earthquakes occurring approximately every 10 years near Torishima on the Izu-Bonin arc are another example. Seismic and tsunami waves from the 2015 event [M-w (moment magnitude) = 5.7] were recorded by an offshore seafloor array of 10 pressure gauges, ~100 km away from the epicenter. We made an array analysis of dispersive tsunamis to locate the tsunami source within the submarine Smith Caldera. The tsunami simulation from a large caldera-floor uplift of ~1.5 m with a small peripheral depression yielded waveforms remarkably similar to the observations. The estimated central uplift, 1.5 m, is ~20 times larger than that inferred from the seismologically determined non-double-couple source. Thus, the tsunami observation is not compatible with the published seismic source model taken at face value. However, given the indeterminacy of M-zx, M-zy, and M-{tensile} of a shallow moment tensor source, it may be possible to find a source mechanism with efficient tsunami but inefficient seismic radiation that can satisfactorily explain both the tsunami and seismic observations, but this question remains unresolved.
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理学研究科
学術雑誌論文
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© 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
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資源タイプ
journal article
言語
English (英語)
eISSN
2375-2548
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関連情報
DOI
https://doi.org/10.1126/sciadv.aao0219
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