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Detection of hydroacoustic signals on a fiber-optic submarine cable

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 detectio...

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Detalles Bibliográficos
Autores principales: Matsumoto, Hiroyuki, Araki, Eiichiro, Kimura, Toshinori, Fujie, Gou, Shiraishi, Kazuya, Tonegawa, Takashi, Obana, Koichiro, Arai, Ryuta, Kaiho, Yuka, Nakamura, Yasuyuki, Yokobiki, Takashi, Kodaira, Shuichi, Takahashi, Narumi, Ellwood, Robert, Yartsev, Victor, Karrenbach, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7854736/
https://www.ncbi.nlm.nih.gov/pubmed/33531541
http://dx.doi.org/10.1038/s41598-021-82093-8
Descripción
Sumario: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 [Formula: see text] 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.