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2020 Fiscal Year Annual Research Report

Pacific Array (1): Exploration of the oldest Pacific mantle

Research Project

Project/Area Number 18H03735
Research InstitutionThe University of Tokyo

Principal Investigator

歌田 久司  東京大学, 地震研究所, 名誉教授 (70134632)

Co-Investigator(Kenkyū-buntansha) 塩原 肇  東京大学, 地震研究所, 教授 (60211950)
川勝 均  東京大学, 地震研究所, 特任研究員 (60242153)
一瀬 建日  東京大学, 地震研究所, 助教 (60359180)
清水 久芳  東京大学, 地震研究所, 教授 (70302619)
馬場 聖至  東京大学, 地震研究所, 准教授 (70371721)
竹内 希  東京大学, 地震研究所, 教授 (90313048)
竹尾 明子  東京大学, 地震研究所, 助教 (90756933)
Project Period (FY) 2018-04-01 – 2021-03-31
Keywordsマントルダイナミクス / 海底長期観測 / リソスフェア・アセノスフェア境界 / 太平洋最古の海底 / 国際連携
Outline of Annual Research Achievements

本研究計画の主要部である太平洋最古の海底を含む海域における海底観測は、韓国の研究船を利用した日韓連携により、ほぼ計画通りに設置及び回収を行うことができた(令和元年度完了)。本年度は引き続きこの観測で得られたデータを解析した。本研究は、当初計画では前年度に終了する予定であったが、新型コロナウイルス感染症拡大の影響で韓国の研究所にある海底地形データの収集及び編集作業ができなかったため、終了することができなかった。本年度においても新型コロナウイルスの状況は好転しなかったが、韓国側研究協力者の協力により、懸案のデータ収集及び編集の作業を工夫することによってこれにより、リモートで行い、必要なデータを揃えることができた。地震観測データと電磁気観測データについて、それぞれ担当者が分担して解析を進め、適宜解析グループ内のミーティングを実施してグループ間の連携を図りつつ、中間解析結果を検討しながら研究を進めることができた。またこの間、日韓共同によるオンラインミーティングを合計4回実施して日韓連携にも配慮した。最終的に本研究の目的である「太平洋最古のマントル」の地震波速度及び電気伝導度構造に関する解析結果を得て、内外の学会で発表するとともに、論文を国際誌に公表した。また、令和3年5月27日と28日にオンラインの国際研究集会「Pacific Array Workshop 2021」を主催して、本研究で得られた主要な成果を発表して国内及び米国・ヨーロッパ・アジアの関連分野の研究者らと集中した議論をおこなった。

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

  • Research Products

    (46 results)

All 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (14 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 14 results,  Open Access: 5 results) Presentation (30 results) (of which Int'l Joint Research: 20 results,  Invited: 4 results) Funded Workshop (1 results)

  • [Int'l Joint Research] ソウル大学(韓国)

    • Country Name
      KOREA (REP. OF KOREA)
    • Counterpart Institution
      ソウル大学
  • [Journal Article] The thermal structure of subduction zones predicted by plate cooling models with variablethermal properties2022

    • Author(s)
      Morishige, M.
    • Journal Title

      Geophysical Journal International

      Volume: 229 Pages: 1490-1502

    • DOI

      10.1093/gji/ggac00

    • Peer Reviewed / Open Access
  • [Journal Article] The effect of initial and prior models on phase tensor inversion of distorted magnetotelluric data2022

    • Author(s)
      Rung-Arunwan T.、Siripunvaraporn W.、Utada H.
    • Journal Title

      Earth, Planets and Space

      Volume: 74 Pages: -

    • DOI

      10.1186/s40623-022-01611-8

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tilt observations at the seafloor by mobile ocean bottom seismometers2021

    • Author(s)
      H. Shiobara, A. Ito, H. Sugioka, M. Shinohara, T. Sato
    • Journal Title

      Front. Earth Sci.

      Volume: 8 Pages: -

    • DOI

      10.3389/feart.2020.5998102021

    • Peer Reviewed
  • [Journal Article] Lithosphere?asthenosphere boundary beneath the Sea of Japan from transdimensional inversion of S-receiver functions2021

    • Author(s)
      Akuhara Takeshi、Nakahigashi Kazuo、Shinohara Masanao、Yamada Tomoaki、Shiobara Hajime、Yamashita Yusuke、Mochizuki Kimihiro、Uehira Kenji
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Pages: -

    • DOI

      10.1186/s40623-021-01501-5

    • Peer Reviewed / Open Access
  • [Journal Article] Analysis on microseism characteristics by typhoon ‘HAGIBIS’ using land and ocean-bottom seismometers2021

    • Author(s)
      Ko Ji-won、Kim Tae-shin、Park Ji-hoon、Oh Se-young、Chang Sung-Joon、Kim Ki Young、Lee Sang-Mook、Kim YoungHee、Utada Hisashi、Kawakatsu Hitoshi、Shiobara Hajime、Isse Takehi、Takeuchi Nozomu
    • Journal Title

      Journal of the Geological Society of Korea

      Volume: 57 Pages: 339~352

    • DOI

      10.14770/jgsk.2021.57.3.339

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Drift of an ocean bottom electromagnetometer from the Bonin to Ryukyu Islands: estimation of the path and travel time by numerical tracking experiments2021

    • Author(s)
      Tada Noriko、Nishikawa Haruka、Ichihara Hiroshi、Watanabe Hiromi Kayama、Kuwatani Tatsu
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Pages: -

    • DOI

      10.1186/s40623-021-01552-8

    • Peer Reviewed / Open Access
  • [Journal Article] A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth2021

    • Author(s)
      Korenaga Tomoko、Korenaga Jun、Kawakatsu Hitoshi、Yamano Makoto
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 126 Pages: -

    • DOI

      10.1029/2020JB021528

    • Peer Reviewed
  • [Journal Article] Seismic evidence for a thermochemical mantle plume underplating the lithosphere of the Ontong Java Plateau2021

    • Author(s)
      Isse Takehi、Suetsugu Daisuke、Ishikawa Akira、Shiobara Hajime、Sugioka Hiroko、Ito Aki、Kawano Yuki、Yoshizawa Kazunori、Ishihara Yasushi、Tanaka Satoru、Obayashi Masayuki、Tonegawa Takashi、Yoshimitsu Junko
    • Journal Title

      Communications Earth & Environment

      Volume: 2 Pages: -

    • DOI

      10.1038/s43247-021-00169-9

    • Peer Reviewed
  • [Journal Article] Unexpected Consequences of Transverse Isotropy2020

    • Author(s)
      Kawakatsu Hitoshi
    • Journal Title

      Bulletin of the Seismological Society of America

      Volume: 111 Pages: 129~138

    • DOI

      10.1785/0120200205

    • Peer Reviewed
  • [Journal Article] Validity of the dispersion relations in magnetotellurics. Part II: synthetic and field data2020

    • Author(s)
      Zorin Nikita、Alekseev Dmitry、Epishkin Dmitrii、Shimizu Hisayoshi、Yakovlev Denis、Zaytsev Sergey
    • Journal Title

      Earth, Planets and Space

      Volume: 72 Pages: -

    • DOI

      10.1186/s40623-020-01273-4

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Persistent Long‐Period Signals Recorded by an OBS Array in the Western‐Central Pacific: Activity of Ambrym Volcano in Vanuatu2020

    • Author(s)
      Kawano Yuki、Isse Takehi、Takeo Akiko、Kawakatsu Hitoshi、Suetsugu Daisuke、Shiobara Hajime、Sugioka Hiroko、Ito Aki、Ishihara Yasushi、Tanaka Satoru、Obayashi Masayuki、Tonegawa Takashi、Yoshimitsu Junko
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Pages: -

    • DOI

      10.1029/2020GL089108

    • Peer Reviewed
  • [Journal Article] Inversion of Longer‐Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere2020

    • Author(s)
      Takeuchi Nozomu、Kawakatsu Hitoshi、Shiobara Hajime、Isse Takehi、Sugioka Hiroko、Ito Aki、Utada Hisashi
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 125 Pages: -

    • DOI

      10.1029/2019JB018810

    • Peer Reviewed
  • [Journal Article] Broadband Ocean Bottom Seismology in Japan2020

    • Author(s)
      SUETSUGU Daisuke、SHIOBARA Hajime
    • Journal Title

      Zisin (Journal of the Seismological Society of Japan. 2nd ser.)

      Volume: 73 Pages: 37~63

    • DOI

      10.4294/zisin.2019-6

    • Peer Reviewed
  • [Journal Article] Probing 1-D electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data2020

    • Author(s)
      Matsuno Tetsuo、Baba Kiyoshi、Utada Hisashi
    • Journal Title

      Geophysical Journal International

      Volume: 222 Pages: 1502~1525

    • DOI

      10.1093/gji/ggaa221

    • Peer Reviewed
  • [Presentation] Analysis on microseism characteristics by typhoon ‘HAGIBIS’ using land and ocean-bottom seismometers2021

    • Author(s)
      Ji-won Ko, Tae-shin Kim, Park Ji-hoon, Oh Se-young, Sung-Joon Chang, Ki Young Kim Sr, Sang-Mook Lee Younghee Kim, Hisashi Utada, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse and Nozomu Takeuchi
    • Organizer
      AGU 2021 fall meeting
    • Int'l Joint Research
  • [Presentation] Seismic Velocity Structure of Upper Mantle Beneath the Oldest Pacific Ocean Basin: Insights from Finite-frequency Tomography2021

    • Author(s)
      H. Kang, Y.H. Kim, S.-H. Hung, P. Lin, T. Isse, H. Shiobara, H. Kawakatsu, S.-M. Lee, H. Utada, N. Takeuchi, H. Sugioka
    • Organizer
      AGU 2021 fall meeting
    • Int'l Joint Research
  • [Presentation] Characteristics of Background Noise in OLDEST-1 Pacific Array Deployed in the Western Pacific2021

    • Author(s)
      Tae-shin Kim, Park Ji-hoon, Oh Se-young, Ji-won Ko, Sung-Joon Chang, Sang-Mook Lee, Younghee Kim, Hisashi Utada, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse and Nozomu Takeuchi
    • Organizer
      AGU 2021 fall meeting
    • Int'l Joint Research
  • [Presentation] 表面波波形フィッティングによる海洋地殻および上部マントルのS波速度構造の推定ー 短周期成分を活用した初期モデルの構築 ー2021

    • Author(s)
      永井 はるか、竹内 希、川勝 均、塩原 肇、一瀬 建日、杉岡 裕子、伊藤 亜妃、歌田 久司
    • Organizer
      日本地震学会2021秋季大会
  • [Presentation] Surface wave envelope fitting for S wave velocity structure of the oceanic upper mantle2021

    • Author(s)
      永井 はるか、竹内 希、川勝 均、塩原 肇、一瀬 建日、杉岡 裕子、伊藤 亜妃、歌田 久司
    • Organizer
      日本地球惑星科学連合2021年大会
  • [Presentation] Seismic structure of the lithosphere-asthenosphere system beneath the oldest seafloor revealed by the broadband dispersion analysis of the Oldest-1 Array2021

    • Author(s)
      川野 由貴、一瀬 建日、竹尾 明子、川勝 均、塩原 肇、竹内 希、杉岡 裕子、Kim YoungHee、歌田 久司、Lee Sang-Mook
    • Organizer
      日本地球惑星科学連合2021年大会
  • [Presentation] Application of the wavefield decomposition for the Oldest-1 array data2021

    • Author(s)
      川勝 均、一瀬 建日、竹内 希、塩原 肇、杉岡 裕子、Kim YoungHee、歌田 久司、Lee Sang-Mook
    • Organizer
      日本地球惑星科学連合2021年大会
  • [Presentation] 海洋プレート冷却モデルが東北地方沈み込み帯の温度構造に与える影響2021

    • Author(s)
      森重学
    • Organizer
      日本地球惑星科学連合2021年大会
    • Invited
  • [Presentation] MCMCを用いた表面波とレシーバー関数の解析による地震波鉛直異方性パラメタ の観測可能性の検証2021

    • Author(s)
      丸山純平, 川勝均, 竹内希
    • Organizer
      日本地球惑星科学連合2021年大会
  • [Presentation] “ふつうの海洋マントル”を探して2021

    • Author(s)
      川勝均
    • Organizer
      InterRidge Japan 流体の地球科学:物理学-化学-地質学-生物学的研究からの統合的な展望
    • Invited
  • [Presentation] Overview of the Pacific Array2021

    • Author(s)
      Hitoshi Kawakatsu
    • Organizer
      Pacific Array Workshop 2021
    • Int'l Joint Research / Invited
  • [Presentation] lectrical conductivity structure of old oceanic mantle in the northwestern Pacific: Achievements for Normal Oceanic Mantle project2021

    • Author(s)
      Baba, K. T. Matsuno, N. Tada, H. Shimizu, and H. Utada
    • Organizer
      International Symposium on Deep Earth Exploration and Practices
    • Int'l Joint Research / Invited
  • [Presentation] Hawaii-Emperor Bending geometry gives chance to estimate mantle viscosity from integrated electrical resistivity, seismic velocity, and geodynamic simulation2021

    • Author(s)
      Baba, K. T. Isse, M. Jegen, M. Moorkamp, A. Schloemer, B. Steinberger, and HEB research group
    • Organizer
      Pacific Array Workshop 2021
    • Int'l Joint Research
  • [Presentation] On synthetic marine magnetotelluric inversion study: reproduction of error in data2021

    • Author(s)
      Baba, K
    • Organizer
      JpGU meeting 2021
  • [Presentation] Pacific Array updates 2021 spring: an international collaboration to image mantle dynamic processes across the Pacific basin2021

    • Author(s)
      Hitoshi Kawakatsu, James Gaherty, Hisashi Utada, Sang-Mook Lee, Young-Hee Kim, Zachary Eilon & International teams
    • Organizer
      IRIS Marine Seismology Symposium
    • Int'l Joint Research
  • [Presentation] 西太平洋の古い海洋底下の3次元上部マントルS波速度構造2020

    • Author(s)
      一瀬建日・川勝均・塩原肇・竹内希・杉岡裕子・YoungHee Kim・歌田久司・ Sang-Mook Lee・吉澤和範
    • Organizer
      日本地震学会2020年度秋季大会
  • [Presentation] Seismic structure of the lithosphere-asthenosphere system beneath the oldest seafloor - the broadband dispersion analysis of the Oldest-1 (Pacific Array) data2020

    • Author(s)
      Y. Kawano, T. Isse, A. Takeo, H. Kawakatsu, H. Shiobara, N. Takeuchi, H. Sugioka, Y.-H. Kim, H. Utada, S.-M. Lee
    • Organizer
      AGU 2020 fall meeting
    • Int'l Joint Research
  • [Presentation] Three dimensional shear wave structure in the upper mantle beneath the oldest Pacific plate2020

    • Author(s)
      T. Isse, H. Kawakatsu, H. Shiobara, N. Takeuchi, H. Sugioka, Y.-H. Kim, H. Utada, S.-M. Lee, K. Yoshizawa
    • Organizer
      AGU 2020 fall meeting
    • Int'l Joint Research
  • [Presentation] Preliminary 1-D electrical conductivity structure of oldest oceanic mantle from magnetotelluric observation2020

    • Author(s)
      Kim H., Baba, K., Utada, H., Shimizu, H., Lee, S.M., Kawakatsu, H., Kim, Y.H., and Oldest-1 Science Team
    • Organizer
      AGU 2020 fall meeting
    • Int'l Joint Research
  • [Presentation] Upper Mantle P-wave Velocity Structure beneath the Oldest Pacific Ocean Basin from Finite-frequency P-wave Traveltime Tomography2020

    • Author(s)
      H. Kang, Y.H. Kim, S.-H. Hung, P. Lin, T. Isse, H. Shiobara, H. Kawakatsu, S.-M. Lee, H. Utada, N. Takeuchi, H. Sugioka
    • Organizer
      AGU 2020 fall meeting
    • Int'l Joint Research
  • [Presentation] The seismic structure of the oldest Pacific: Preliminary results from the broadband Rayleigh-wave dispersion analysis of the Pacific Array, Oldest-12020

    • Author(s)
      Y. Kawano, T. Isse, A. Takeo, H. Kawakatsu, H. Shiobara, N. Takeuchi, H. Sugioka, Y.-H. Kim, H. Utada, S.-M. Lee
    • Organizer
      JpGU-AGU joint meeting 2020
  • [Presentation] Future geophysical observation on oceanic lithosphere and asthenosphere study: Hawaii-Emperor Bend (HEB) Project2020

    • Author(s)
      Baba, K., Steinberger, B., Jenen, M., Moorkamp, M., Isse T., Takeo, A., Schloemer, A., and HEB research group
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] Topography on the mantle discontinuities beneath the Ontong Java Plateau2020

    • Author(s)
      D. Suetsugu, H. Shiobara, H. Sugioka, A. Ito, T. Isse, Y. Ishihara, S. Tanaka, M. Obayashi, T. Tonegawa, J. Yoshimitsu, T. Kobayashi
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] The electrical conductivity structure of the oldest Pacific: Preliminary results from magnetotelluric observation data of Pacific Array, Oldest-12020

    • Author(s)
      Kim, H., Baba, K., Utada, H., Lee, S.M., Kawakatsu, H., Kim, Y.H.
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] Seismic velocity structure beneath the oldest region of the Pacific ocean basin from multiscale finite-frequency traveltime tomography2020

    • Author(s)
      H. Kang, Y.H. Kim, S.-H. Hung, P. Lin, T. Isse, H. Shiobara, H. Kawakatsu, S.-M. Lee, H. Utada, N. Takeuchi, H. Sugioka
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] The Oldest Array: Japan-Korea Pacific Array collaboration to study the lithosphere-asthenosphere system below the oldest part of the Pacific Ocean2020

    • Author(s)
      Shiobara, H., Utada, H., Kim, S.S., Kim, Y.H., Baba, K., Isse, T., Kim H., Kim H., Sugioka, H., Takeuchi, N., Kawano, Y., Kawakatsu, H., Lee, S.M., and Onboard scientists of 2018/2019 Oldest cruises
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] Three dimensional shear wave structure in the upper mantle beneath the oldest Pacific plate2020

    • Author(s)
      T. Isse, H. Kawakatsu, H. Shiobara, N. Takeuchi, H. Sugioka, Y.-H. Kim, H. Utada, S.-M. Lee, K. Yoshizawa
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] Oldest Array (Pacific Array on the oldest seafloor), the first result2020

    • Author(s)
      Kawakatsu, H., Utada, H., Lee, S.M., Kim, Y.H., Shiobara, H., Takeuchi, N., Baba, K., Isse, T., Takeo, A., Kim, H.
    • Organizer
      EGU General Assembly 2020
    • Int'l Joint Research
  • [Presentation] Pacific Array update 20202020

    • Author(s)
      Hitoshi Kawakatsu, and the international Pacific Array team
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Presentation] P Velocity Heterogeneities in the Upper Mantle beneath the Northwestern Pacific2020

    • Author(s)
      N. Takeuchi, H. Kawakatsu, H. Shiobara, T. Isse, H. Sugioka, A. Ito, H. Utada
    • Organizer
      JpGU-AGU joint meeting 2020
    • Int'l Joint Research
  • [Funded Workshop] Pacific Array Workshop 20212021

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Published: 2022-12-28  

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