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Extension of the explorable range of muography to ocean with underwater tunnel

Research Project

Project/Area Number 20K20528
Research Category

Grant-in-Aid for Challenging Research (Pioneering)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 17:Earth and planetary science and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Tanaka Hiroyuki  東京大学, 地震研究所, 教授 (20503858)

Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
Keywordsミュオグラフィ / 海域 / 海底トンネル / 海底 / ミュオン / 海 / 潮位 / 海域透視
Outline of Research at the Start

海底トンネルを長さ1㎞の長大な海底下センサーとすることで、海底下における巨大物体透視技術「ミュオグラフィ」が将来新たにサイエンスターゲットを狙うための技術的課題の検証、解決を行い、海底トンネルを使用した海底ミュオグラフィの方法論を確立する。これまで難しかった海底岩盤の正確な絶対密度測定、海面昇降現象の面的なイメージング等が可能となり、海域のリアルタイムイメージング等へとつなぐ新たな技術開発を実施する。

Outline of Final Research Achievements

Muography has been applied to monitoring of magma and to searching for the internal structure of the pyramid. However its observational targets have been restricted to the objects located on land. Muons are mainly produced in the upper troposphere, but their attenuation varies according to changes in the local atmospheric pressure. Land-based muographic observations are affected by these atmospheric pressure changes, making it extremely difficult to capture density variations with a precision < 1 percent. With this study, the world's highest muographic precision was achieved: 3 permil in 2 hours (1.5 permil in one lunar day) in terms of temporal variations in density. We succeeded in real-time monitoring of temporal variations in sea level.

Academic Significance and Societal Importance of the Research Achievements

今後、HKMSDDをさまざまな海洋・海底下環境に活用することにより、国内外に散在する海底トンネルを活用した台風や、地震による津波、海底砂丘の移動による海底地形変化などの高精度イメージング測定などの応用展開が期待される。更に、海洋ダイナミクスによる海水密度変化などの測定や、東京湾海底における南関東ガス田に係る評価にも活用できるようになると考えられる。将来、海底トンネルから実際の深海底へと展開することにより、二酸化炭素貯留隔離(CCS)モニタリングや海底火山など、現場で連続的に海洋・海底下環境を監視・評価できる新しいイメージング技術としての応用展開が期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 Other

All Int'l Joint Research (7 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results)

  • [Int'l Joint Research] Salerno University(イタリア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Wigner Research Centre for Physics(ハンガリー)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Sheffield/STFC/Durham University(英国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] INFN/University of Catania/University of Salerno(イタリア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Oulu(フィンランド)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Wigner Research Center for Physics(ハンガリー)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Atacama University(チリ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Periodic sea-level oscillation in Tokyo Bay detected with the Tokyo-Bay seafloor hyper-kilometric submarine deep detector (TS-HKMSDD)2022

    • Author(s)
      Tanaka Hiroyuki et al.
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1

    • DOI

      10.1038/s41598-022-10078-2

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] First results of undersea muography with the Tokyo-Bay Seafloor Hyper-Kilometric Submarine Deep Detector.2021

    • Author(s)
      Tanaka, H.K.M., Aichi, M., Bozza, C. et al.
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1

    • DOI

      10.1038/s41598-021-98559-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research

URL: 

Published: 2020-08-03   Modified: 2024-01-30  

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