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Detection of hydroacoustic signals on a fiber-optic submarine cable
https://nied-repo.bosai.go.jp/records/4630
https://nied-repo.bosai.go.jp/records/46305f29bbe2-70bf-4534-9956-99ecd1f42b06
| Item type | researchmap(1) | |||||||||||||||||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| タイトル | Detection of hydroacoustic signals on a fiber-optic submarine cable | |||||||||||||||||||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||||||||||||||||||
| 著者 |
Hiroyuki Matsumoto
× Hiroyuki Matsumoto
× Eiichiro Araki
× Toshinori Kimura
× Gou Fujie
× Kazuya Shiraishi
× Takashi Tonegawa
× Koichiro Obana
× Ryuta Arai
× Yuka Kaiho
× Yasuyuki Nakamura
× Takashi Yokobiki
× Shuichi Kodaira
× Narumi Takahashi
× Robert Ellwood
× Victor Yartsev
× Martin Karrenbach
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| 抄録 | ||||||||||||||||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||||||||||||||||
| 内容記述 | <title>Abstract</title>A ship-based seismic survey was conducted close to a fiber-optic submarine cable, and 50 km-long distributed acoustic sensing (DAS) recordings with air-gun shots were obtained for the first time. We examine the acquired DAS dataset together with the co-located hydrophones to investigate the detection capability of underwater acoustic (hydroacoustic) signals. Here, we show the hydroacoustic signals identified by the DAS measurement characterizing in frequency-time space. The DAS measurement can be sensitive for hydroacoustic signals in a frequency range from <inline-formula><alternatives><tex-math>$$10^{-1}\,\text {Hz}$$</tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:mspace /> <mml:mtext>Hz</mml:mtext> </mml:mrow> </mml:math></alternatives></inline-formula> to a few tens of Hz which is similar to the hydrophones. The observed phases of hydroacoustic signals are coherent within a few kilometers along the submarine cable, suggesting the DAS is suitable for applying correlation analysis using hydroacoustic signals. Although our study suggests that virtual sensor’s self-noise of the present DAS measurement is relatively high compared to the conventional in-situ hydroacoustic sensors above a few Hz, the DAS identifies the ocean microseismic background noise along the entire submarine cable except for some cable sections de-coupled from the seafloor. |
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| 言語 | en | |||||||||||||||||||||||||||||||||||||
| 書誌情報 |
en : Scientific Reports 巻 11, 号 1, 発行日 2021-12 |
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| 出版者 | ||||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| 出版者 | Springer Science and Business Media LLC | |||||||||||||||||||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||||||||||||||||
| 収録物識別子 | 2045-2322 | |||||||||||||||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||||||||||||||
| 関連識別子 | 10.1038/s41598-021-82093-8 | |||||||||||||||||||||||||||||||||||||
