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Distributed sensing of microseisms and teleseisms with submarine dark fibers

Nature communications, 2019-12, Vol.10 (1), p.5778-11, Article 5778 [Peer Reviewed Journal]

2019. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;The Author(s) 2019 ;ISSN: 2041-1723 ;EISSN: 2041-1723 ;DOI: 10.1038/s41467-019-13262-7 ;PMID: 31852889

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  • Title:
    Distributed sensing of microseisms and teleseisms with submarine dark fibers
  • Author: Williams, Ethan F ; Fernández-Ruiz, María R ; Magalhaes, Regina ; Vanthillo, Roel ; Zhan, Zhongwen ; González-Herráez, Miguel ; Martins, Hugo F
  • Subjects: Acoustics ; Arrays ; Boreholes ; Cables ; Dark fibers ; Earthquakes ; Fiber optics ; Geophysics ; Gravity waves ; Microseisms ; Ocean bottom ; Ocean currents ; Ocean waves ; Optical fibers ; Optics ; Sensors ; Telemetry
  • Is Part Of: Nature communications, 2019-12, Vol.10 (1), p.5778-11, Article 5778
  • Description: Sparse seismic instrumentation in the oceans limits our understanding of deep Earth dynamics and submarine earthquakes. Distributed acoustic sensing (DAS), an emerging technology that converts optical fiber to seismic sensors, allows us to leverage pre-existing submarine telecommunication cables for seismic monitoring. Here we report observations of microseism, local surface gravity waves, and a teleseismic earthquake along a 4192-sensor ocean-bottom DAS array offshore Belgium. We observe in-situ how opposing groups of ocean surface gravity waves generate double-frequency seismic Scholte waves, as described by the Longuet-Higgins theory of microseism generation. We also extract P- and S-wave phases from the 2018-08-19 [Formula: see text] Fiji deep earthquake in the 0.01-1 Hz frequency band, though waveform fidelity is low at high frequencies. These results suggest significant potential of DAS in next-generation submarine seismic networks.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2041-1723
    EISSN: 2041-1723
    DOI: 10.1038/s41467-019-13262-7
    PMID: 31852889
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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