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Deciphering continuous gravity, strain and tilt data with cosmic-ray radiography for mass transport under volcanoes

Research Project

Project/Area Number 18H01305
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionThe University of Tokyo

Principal Investigator

Okubo Shuhei  東京大学, 地震研究所, 名誉教授 (30152078)

Co-Investigator(Kenkyū-buntansha) 西山 竜一  東京大学, 地震研究所, 助教 (10835101)
田中 宏幸  東京大学, 地震研究所, 教授 (20503858)
山本 圭吾  京都大学, 防災研究所, 助教 (40283676)
井口 正人  京都大学, 防災研究所, 教授 (60144391)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2018: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
Keywords重力 / 地殻変動 / 宇宙線透視 / 火山 / マグマ移動 / 地下水 / 潮汐 / 火道 / 火山噴火 / マグマ
Outline of Final Research Achievements

We develop a method for eliminating the effect of groundwater disturbance on gravity change. It enables us to extract signal of volcanic origin from the gravity change record.
The method was applied to the date of the 2018 eruption of Mt. Shinmoe. We found significant mass transfer to an area at 7km below the sealevel prior to the onset of lava extrusion.
The gravity signal at Sakurajima volcano strongly suggested drastic change of volcanic activity around 2016, which is consistent with the surface phenomena.

Academic Significance and Societal Importance of the Research Achievements

火山活動を解明するうえで、地震活動や地殻変動にもとづく研究は重要であることは確かであるが、その一方で、それらはあくまでも力学モデルに基づくものであって、マグマの移動そのものを直接的に検知するものではないという弱点があった。本研究では、物質移動そのものに感度を有する物理量である重力を用いて、時間的に連続かつ1時間程度という高い分解能で、マグマの移動を追跡したという学術的な意義がある。
社会的には、火山噴火のメカニズムの解明を通じて災害軽減につながることが期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (14 results)

All 2023 2022 2020 2019 2018

All Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Deformation of an infinite elastic cone due to a point pressure source buried on the axis: implications to volcanic deformation2023

    • Author(s)
      R. Nishiyama
    • Journal Title

      Geophysical Journal International

      Volume: 232(2) Issue: 2 Pages: 1129-1139

    • DOI

      10.1093/gji/ggac379

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Muography for a dense tide monitoring network2022

    • Author(s)
      Tanaka Hiroyuki K. M.
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 1-13

    • DOI

      10.1038/s41598-022-10373-y

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sequence of Volcanic Activity of Sakurajima Volcano, Japan, as Revealed by Non-Eruptive Deflation2022

    • Author(s)
      Iguchi Masato、Yamada Taishi、Tameguri Takeshi
    • Journal Title

      Frontiers in Earth Science

      Volume: 10 Pages: 1-14

    • DOI

      10.3389/feart.2022.727909

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Advances in gravity analyses for studying volcanoes and earthquakes2020

    • Author(s)
      OKUBO Shuhei
    • Journal Title

      Proceedings of the Japan Academy, Series B

      Volume: 96 Issue: 2 Pages: 50-69

    • DOI

      10.2183/pjab.96.005

    • NAID

      130007796067

    • ISSN
      0386-2208, 1349-2896
    • Year and Date
      2020-02-10
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Muographic Observation of Density Variations in the Vicinity of Minami-Dake Crater of Sakurajima Volcano2019

    • Author(s)
      Olah L., Tanaka H.K. M., Hamar G, Varga Dezs
    • Journal Title

      Journal of Disaster Research

      Volume: 14 Issue: 5 Pages: 701-712

    • DOI

      10.20965/jdr.2019.p0701

    • NAID

      130007687159

    • ISSN
      1881-2473, 1883-8030
    • Year and Date
      2019-08-01
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Plug Formation Imaged Beneath the Active Craters of Sakurajima Volcano With Muography2019

    • Author(s)
      Olah L.,Tanaka H. K.M.,Ohminato T. Hamar G., Varga D.
    • Journal Title

      Geophysical Research Letters

      Volume: 46 Issue: 17-18 Pages: 10417-10424

    • DOI

      10.1029/2019gl084784

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 富士山頂における絶対重力観測-その学術的・技術的意義と地震・火山観測への展開2019

    • Author(s)
      大久保修平
    • Journal Title

      山梨県富士山科学研究所国際シンポジウム2018-火山モニタリング観測と火山活動予測-報告書

      Volume: - Pages: 72-103

    • Related Report
      2018 Annual Research Report
  • [Presentation] 海洋島の地下水潮汐のハイブリッドモデリング― 桜島島内の観測を用いた検証2022

    • Author(s)
      大久保修平, 山本圭吾, 井口正人
    • Organizer
      日本測地学会第138回講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Diagnosis of Conduit State of Sakurajima Volcano Using Continuous Records on Gravity and Crustal Movements and Muon Radiography2019

    • Author(s)
      Okubo, S., K. Yamamoto, M. Iguchi, H. Tanaka.
    • Organizer
      General Assembly of IUGG 2019, Montreal
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Forecasting Volcanic Eruption of Sakurajima Volcano Based on Magma Intrusion Rate in Recent 100 Years2019

    • Author(s)
      Iguchi, M. T. Tameguri, J.Hirabayashi, H. Nakamichi
    • Organizer
      General Assembly of IUGG 2019, Montreal
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 絶対重力の長期変動から読み解く桜島の火山活動(2009年~2018年)2019

    • Author(s)
      大久保 修平, 山本 圭吾, 井口 正人, 田中 愛幸, 今西 祐一, 西山 竜一, 安藤 美和子, 渡邉 篤志
    • Organizer
      日本地球惑星科学連合合同大会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 地盤変動に続く地震活動に関する考察2019

    • Author(s)
      井口正人
    • Organizer
      日本火山学会 2019 年度秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Absolute gravity on the top of Mt. Fuji - its scientific and technical implications to the studies on earthquake and active volcanoes2018

    • Author(s)
      大久保修平
    • Organizer
      MFRI International Symposium 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 霧島新燃岳2017年噴火後の重力変化2018

    • Author(s)
      大久保修平・安藤美和子
    • Organizer
      地球惑星科学連合2018年合同大会
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2024-01-30  

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