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Hydroacoustic observation and earthquake monitoring

Research Project

Project/Area Number 17K18948
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Social systems engineering, Safety engineering, Disaster prevention engineering, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Yamada Tomoaki  東京大学, 地震研究所, 助教 (40323654)

Project Period (FY) 2017-06-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords水中音波 / 海中観測 / 海底観測 / 海中発破 / 海底地震記録 / 水中音波記録 / 音響センシング / 海底ケーブル / 機動観測 / 制御震源 / 日本海溝 / 受信強度 / 海中測定 / 地震津波
Outline of Final Research Achievements

We investigate signal intensity and arrival directions based on hydroacoustic stations, which are operated by CTBTO, and ocean bottom seismometers and hydrophones. Hydroacoustic data show received signals over long distances across the Pacific Ocean, and comparison with 3D propagation simulations revealed that transmission losses due to seamounts on the path and diffraction effects explain the received signal reduction and delayed travel time based on a standard 1D structure. Furthermore, there are many reflected waves from marginal areas of the Pacific Rim and oceanic islands. The received signals on ocean bottom instruments varies greatly with location, especially with the depth of the installation.

Academic Significance and Societal Importance of the Research Achievements

水中音波観測の有効な場所を示すと同時に、機動海底地震観測時に併用できる音波観測システムを開発した。また、本研究で利用した水中音波観測データは、包括的核実験条約機関準備委員会が、国際監視制度(IMS)の一つとして、海中における核実験監視のために整備を行い、取得されたものである。整備が進められて以降、公になっている海中での核実験は存在しないが、本研究では既知の海中発破データを用いることで、実データに基づく水中音波観測点の検知能力を示した。

Report

(7 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (12 results)

All 2022 2019 2018 2017 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Int'l Joint Research] CTBTO(オーストリア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] CTBTO(オーストリア)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] CTBTO(オーストリア)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2017 Research-status Report
  • [Journal Article] Performance of seismic observation by distributed acoustic sensing technology using a seafloor cable off Sanriku, Japan2022

    • Author(s)
      Shinohara, M., T. Yamada, T. Akuhara, K. Mochizuki, and S. Sakai
    • Journal Title

      Front. Mar. Sci.

      Volume: 9

    • DOI

      10.3389/fmars.2022.844506

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detailed S-wave velocity structure of sediment and crust off Sanriku, Japan by a new analysis method for distributed acoustic sensing data using a seafloor cable and seismic interferometry2022

    • Author(s)
      Fukushima Shun、Shinohara Masanao、Nishida Kiwamu、Takeo Akiko、Yamada Tomoaki、Yomogida Kiyoshi
    • Journal Title

      Earth, Planets and Space

      Volume: 74 Issue: 1 Pages: 1-11

    • DOI

      10.1186/s40623-022-01652-z

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonlinear Earthquake Response of Marine Sediments With Distributed Acoustic Sensing2022

    • Author(s)
      Viens Loic、Bonilla Luis Fabian、Spica Zack J.、Nishida Kiwamu、Yamada Tomoaki、Shinohara Masanao
    • Journal Title

      Geophysical Research Letters

      Volume: 49 Issue: 21

    • DOI

      10.1029/2022gl100122

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Seafloor seismic observatories along the Japan Trench and their data2019

    • Author(s)
      Tomoaki Yamada, Kenji Uehira, Masanao Shinohara
    • Organizer
      International Hydroacoustics Workshop
    • Related Report
      2019 Research-status Report
  • [Presentation] Hydroacoustic signals from controlled underwater seismic survey sources in the Pacific2018

    • Author(s)
      Tomoaki Yamada, Georgios Haralabus, Mario Zampolli, Kevin Heaney
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Hydroacoustic records from non-tsunamigenic events and tsunamigenic earthquakes in the Pacific Ocean2018

    • Author(s)
      Tomoaki Yamada, Masanao Shinohara
    • Organizer
      American Geophysical Union Fall Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Long-range underwater acoustic propagation from controlled underwater sources received at IMS hydroacoustic stations2017

    • Author(s)
      Tomoaki Yamada, Georgios Haralabus, Mario Zampolli, Kevin Heaney
    • Organizer
      Joint Scientific Assembly of the International Association of Geodesy and the International Association of Seismology and Physics of the Earth's Interior
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Underwater acoustic records from underwater controlled sources and earthquakes on the Japan Trench seismic network2017

    • Author(s)
      Tomoaki Yamada, Masanao Shinohara, Gou Fujie, Masashi Mochizuki, Kenji Uehira
    • Organizer
      American Geophysical Union Fall Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-07-21   Modified: 2024-01-30  

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