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Quasi-realtime detection of basal melting of the Greenland Ice Sheet by seismological methods

Research Project

Project/Area Number 18K03794
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionTohoku University

Principal Investigator

Toyokuni Genti  東北大学, 理学研究科, 助教 (90626871)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsグリーンランド / 地震波トモグラフィー / 地震波形解析 / ホットプルーム / 地殻 / マントル / 地震学 / マントルプルーム / 大西洋中央海嶺 / グリーンランド氷床 / 氷床融解 / アイスランドプルーム / 準リアルタイム監視 / 地震波干渉法 / 地震波 / 氷床底部融解 / 準リアルタイム / 環境変動
Outline of Final Research Achievements

In Greenland, located in the Arctic, a steady seismic network had not been deployed for a long time due to the harsh environment on the ice sheet. In this study, we analyze the seismic waveform and P-wave arrival-time data obtained by the newly established seismic network "GLISN", and revealed for the first time the 3-D crust and mantle structure beneath this area, as well as the seismic attenuation (Q factor) of the entire ice sheet. The main achievement is the discovery of a hot mantle plume rising from the core-mantle boundary to the mantle transition zone beneath Greenland, named "Greenland Plume", which may be a heat source for basal melting of the ice sheet and active volcanoes distributed along the Mid-Atlantic Ridge. A series of our achievements have been published as four international papers.

Academic Significance and Societal Importance of the Research Achievements

グリーンランドとその周辺地域では,氷床の底部融解やスバールバル諸島西部の特異的な高地殻熱流量,大西洋中央海嶺に沿った活発な火山活動といった現象が知られていたが,これらの間の関連は不明であった.本課題の一連の研究によって,これらはグリーンランドプルームとその支流の活動として統一的に説明が可能となった.特に氷床の底部融解に伴う海水準変動や火山活動よる環境変化は我々の生活とも密接に関わる問題であり,その根源となるメカニズムを提唱したことは学術的・社会的意義が極めて大きい.

Report

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

    (31 results)

All 2021 2020 2019 2018 Other

All Journal Article (9 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (20 results) (of which Int'l Joint Research: 12 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] P-Wave Tomography for 3-D Radial and Azimuthal Anisotropy Beneath Greenland and Surrounding Regions2021

    • Author(s)
      Toyokuni, G. & Zhao, D.
    • Journal Title

      Earth and Space Science

      Volume: 8 Issue: 12

    • DOI

      10.1029/2021ea001800

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Arctic rift system driven by a giant stagnant slab2021

    • Author(s)
      Toyokuni, G. & Zhao, D.
    • Journal Title

      ESSOArプレプリント

      Volume: -

    • DOI

      10.1002/essoar.10507442.1

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Structural control on the 2018 and 2019 Hualien earthquakes in Taiwan2021

    • Author(s)
      Toyokuni, G., Zhao, D., & Chen, K. H.
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 312 Pages: 106673-106673

    • DOI

      10.1016/j.pepi.2021.106673

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Estimation of seismic attenuation of the Greenland Ice Sheet using 3‐D waveform modeling2021

    • Author(s)
      Toyokuni, G., Komatsu, M., & Takenaka, H.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 126 Issue: 4

    • DOI

      10.1029/2021jb021694

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ambient noise correlation analysis of S-net records: extracting surface wave signals below instrument noise levels2021

    • Author(s)
      Takagi, R., Toyokuni, G. & Chikasada, N.
    • Journal Title

      Geophysical Journal International

      Volume: 224(3) Issue: 3 Pages: 1640-1657

    • DOI

      10.1093/gji/ggaa548

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Deep mantle structure and origin of Cenozoic intraplate volcanoes in Indochina, Hainan and South China Sea2021

    • Author(s)
      Zhao, D., Toyokuni, G., & Kurata, K.
    • Journal Title

      Geophysical Journal International

      Volume: 225(1) Issue: 1 Pages: 572-588

    • DOI

      10.1093/gji/ggaa605

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] P wave tomography beneath Greenland and surrounding regions: 1. Crust and upper mantle2020

    • Author(s)
      Toyokuni, G., Matsuno, T., & Zhao, D.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 125(12) Issue: 12

    • DOI

      10.1029/2020jb019837

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] P wave tomography beneath Greenland and surrounding regions: 2. Lower mantle2020

    • Author(s)
      Toyokuni, G., Matsuno, T., & Zhao, D.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 125(12) Issue: 12

    • DOI

      10.1029/2020jb019839

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Changes in Greenland ice bed conditions inferred from seismology2018

    • Author(s)
      Toyokuni Genti、Takenaka Hiroshi、Takagi Ryota、Kanao Masaki、Tsuboi Seiji、Tono Yoko、Childs Dean、Zhao Dapeng
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 277 Pages: 81-98

    • DOI

      10.1016/j.pepi.2017.10.010

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] グリーンランドとその周辺地域下のP波鉛直異方性および方位異方性トモグラフィー2021

    • Author(s)
      豊国源知・趙大鵬
    • Organizer
      可聴下波動伝播特性による極域の多圏融合物理現象解明に関する研究集会-ⅤI
    • Related Report
      2020 Research-status Report
  • [Presentation] P-wave tomography beneath Greenland and surrounding regions2020

    • Author(s)
      Toyokuni, G., Matsuno, T. & Zhao, D.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Seismic observations in Greenland by a joint USA and Japanese GLISN team (2011-2019)2020

    • Author(s)
      Toyokuni, G., Kanao, M. & Tsuboi, S.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Seismic imaging of the Tohoku megathrust zone using S-net and Hi-net data2020

    • Author(s)
      Zhao, D., Hua, Y. & Toyokuni, G.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Whole-mantle P-wave tomography beneath East Asia2020

    • Author(s)
      Katayama, Y., Zhao, D. & Toyokuni, G.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Seismic velocity structure along the Japan trench inferred from ambient noise and teleseismic surface waves observed by S-net2020

    • Author(s)
      Takagi, R., Ishigami, A., Toyokuni, G., Azuma, R. & Yamamoto, M.
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] S-netデータによる東日本前弧域の不均質構造と地震発生機構2020

    • Author(s)
      趙大鵬, Hua, Y., 豊国源知, Yu, Z.
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] S-net観測網を用いた東北日本前弧域の3次元S波速度構造2020

    • Author(s)
      片山悠, 趙大鵬, 豊国源知
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] A decade of scientific contribution to the Greenland Ice Sheet Monitoring Network (GLISN)2020

    • Author(s)
      Kanao, M., G. Toyokuni, and S. Tsuboi
    • Organizer
      Sixth International Symposium on Arctic Research
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] グリーンランドとその周辺地域下のP波トモグラフィー2020

    • Author(s)
      豊国源知・松野貴也・趙 大鵬
    • Organizer
      可聴下波動伝播特性による極域の多圏融合物理現象解明に関する研究集会-Ⅴ
    • Related Report
      2019 Research-status Report
  • [Presentation] P-wave tomography beneath Greenland2019

    • Author(s)
      Matsuno, T., G. Toyokuni, and D. Zhao
    • Organizer
      Japan Geoscience Union Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Q-factor estimation for Greenland ice sheet using 3-D seismic waveform modeling2019

    • Author(s)
      Toyokuni, G., H. Takenaka, M. Komatsu, R. Takagi, M. Kanao, and S. Tsuboi
    • Organizer
      Japan Geoscience Union Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Seismic observations in Greenland by a joint USA and Japanese GLISN team (2011-2018)2019

    • Author(s)
      Toyokuni, G., M. Kanao, S. Tsuboi, and Y. Tono
    • Organizer
      Japan Geoscience Union Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] グリーンランドにおけるP波走時トモグラフィー2019

    • Author(s)
      松野貴也・豊国源知・趙 大鵬
    • Organizer
      日本地震学会2019年度秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] P-wave tomography beneath Greenland2019

    • Author(s)
      Toyokuni, G., T. Matsuno, and D. Zhao
    • Organizer
      The 10th Symposium on Polar Science
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] グリーンランドGLISN観測の現況2019

    • Author(s)
      豊国源知
    • Organizer
      可聴下波動伝播特性による極域の多圏融合物理現象解明に関する研究集会IV
    • Related Report
      2018 Research-status Report
  • [Presentation] GLISN関連の研究の進捗状況:地震波トモグラフィーによる予備的成果2019

    • Author(s)
      豊国源知
    • Organizer
      可聴下波動伝播特性による極域の多圏融合物理現象解明に関する研究集会IV
    • Related Report
      2018 Research-status Report
  • [Presentation] Changes in surface-wave phase velocities below the Greenland Ice Sheet measured from three-component ambient noise correlation method2018

    • Author(s)
      Toyokuni, G., R. Takagi, H. Takenaka, M. Kanao, S. Tsuboi, and Y. Tono
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Seismic observations in Greenland by a joint USA and Japanese GLISN team (2011-2017)2018

    • Author(s)
      Toyokuni, G., D. Childs, M. Kanao, Y. Tono, and S. Tsuboi
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 3次元理論地震波形計算によるグリーンランド氷床のQ値の推定2018

    • Author(s)
      豊国源知・竹中博士・小松正直・高木涼太・金尾政紀・ 坪井誠司
    • Organizer
      日本地震学会2018年度秋季大会
    • Related Report
      2018 Research-status Report
  • [Remarks] グリーンランドの地下深くに隠されていた「熱い流れ」

    • URL

      https://www.sci.tohoku.ac.jp/news/20201207-11336.html

    • Related Report
      2020 Research-status Report
  • [Remarks] Newly Discovered Greenland Plume

    • URL

      https://www.tohoku.ac.jp/en/press/greenland_plume_drive_thermal_activities.html

    • Related Report
      2020 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2023-01-30  

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