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Points to lines/surface: Development of innovative analytical methods for next-generation seismic/tsunami data

Research Project

Project/Area Number 21K03693
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 InstitutionHokkaido University

Principal Investigator

Yomogida Kiyoshi  北海道大学, 理学研究院, 名誉教授 (70230844)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords次世代高密度地震津波観測網 / DAS / 海底光ケーブル / 海底水圧計 / 表面波 / 浅部S波構造 / 津波励起過程 / 高密度アレイ記録 / OBSとDAS記録 / 波形分離 / 津波 / 海底水圧計記録 / カルマンフィルタ / 断層破壊過程 / 震源過程 / バックプロジェクション / 時空間フィルタ / 雑微動 / 2次元S波速度構造 / 海底観測網 / 海底浅部S波速度構造 / 津波波源 / 散乱 / 海底観測データ / 地震波・津波伝搬 / 連続アレイ解析 / 微細不均質性
Outline of Research at the Start

従来の離散的な時系列データによる地震波・津波の励起・伝搬の研究は、陸上と新たな海底の稠密観測網の発達、光ファイバによるDASという革新的技術の計測系の登場により、空間的な連続データへと急速に移行しつつある。地震学では位相・走時が主に解析されていたが、見かけ速度・偏向面・振幅といった正確な計測がこれまで困難だった観測量も容易に得られることになる。質量ともに格段に向上する次世代の地震データの解析を、Deep Learningなど他分野で発展中の新手法に加え、早期推定も含めた、震源・構造の目的に特化した独創的な解析法を開発する。

Outline of Final Research Achievements

Seismic and tsunami records have been point-like in space, but recent technological advances start providing us with line-like or two-dimensional data, or no longer time-series but pictures or even videos. In this project, we have developed new approaches for such new data of high quality and vast quantity.
Using optical cable DAS data, a shallow marine structure of S-wave velocity was obtained of high resolution. Together with previous P-wave results, we can discuss its physical properties and constitutive materials for the first time. With ocean-bottom pressure data, we estimated detail fault motions of a marine earthquake that exited tsunamis, using a projection method of records, which is superior to conventional waveform inversions. In addition, a new atmosphere-ocean coupled event was identified and simulated for the 2022 Tonga volcanic eruption. We also monitored temporal variations of shallow seismic activities near a trench axis with continuous OBS records over 10 years.

Academic Significance and Societal Importance of the Research Achievements

観測点数の少なさが制約の地震・津波研究は、1990年代からの観測網の整備に続き、光ファイバーを用いたDASや海底水圧計など最新の計測技術により、空間的に連続なデータや時間変化の検出が可能となってきた。従来と異なる複雑な処理過程を排した解析法の開発により、海底浅部の不均質構造や津波励起の海底地震の震源過程について、より高分解能・高信頼度の結果を本研究は可能とした。
稠密観測網は陸海両地域で今後一層展開され、さらに大量データが供給されるはずで、本研究での新しい視点が地震・津波研究で普及すれば、その解明に飛躍的発展するだけでなく、新たな有効な観測計画の構築立案にも貢献が期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (27 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 6 results) Presentation (18 results) (of which Int'l Joint Research: 6 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] オレゴン大学(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Retrieval and precise phase-velocity estimation of Rayleigh waves by the spatial autocorrelation method between distributed acoustic sensing and seismometer data2024

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

      Geophysical Journal International

      Volume: 237 Issue: 2 Pages: 1174-1188

    • DOI

      10.1093/gji/ggae103

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Source estimation of the tsunami later phases associated with the 2022 Hunga Tonga volcanic eruption2023

    • Author(s)
      Mizutani Ayumu、Yomogida Kiyoshi
    • Journal Title

      Geophysical Journal International

      Volume: 234 Issue: 3 Pages: 1885-1902

    • DOI

      10.1093/gji/ggad174

    • Related Report
      2023 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 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Back‐Projection Imaging of a Tsunami Excitation Area With Ocean‐Bottom Pressure Gauge Array Data2022

    • Author(s)
      Mizutani Ayumu、Yomogida Kiyoshi
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 127 Issue: 7 Pages: 1-20

    • DOI

      10.1029/2022jc018480

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Fluid migration before and during slow earthquakes in the shallow Nankai subduction zone2022

    • Author(s)
      Tonegawa, T., S. Takemura, S. Yabe and K. Yomogida
    • Journal Title

      J. Geophys. Res. Solid Earth

      Volume: 127 Issue: 3 Pages: 1-15

    • DOI

      10.1029/2021jb023583

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Estimation of relative source locations from seismic amplitude: application to earthquakes and tremors at Meakandake volcano, eastern Hokkaido, Japan2021

    • Author(s)
      Ogiso, M., and K. Yomogida
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Issue: 1

    • DOI

      10.1186/s40623-021-01366-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases2021

    • Author(s)
      Shiina Takahiro, Katsumata Kei, Yomogida Kiyoshi, Kato Aitaro
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Issue: 1 Pages: 33-33

    • DOI

      10.1186/s40623-021-01361-z

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 海底地震観測網S-net観測点のサイト増幅特性の推定2023

    • Author(s)
      蓬田 清, 井上 翔
    • Organizer
      日本地球惑星科学連合 2023年大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Numerical modeling of the significant tsunami later phase associated with the 2020 Tonga volcanic eruption2023

    • Author(s)
      Ayumu Mizutani, Kiyoshi Yomogida
    • Organizer
      日本地球惑星科学連合 2023年大会
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] DASと3成分地震計によるspatial autocorrelationの定式化とLove波のDAS地震波干渉法への影響2023

    • Author(s)
      福島 駿, 篠原 雅尚, 山田 知朗, 西田 究, 竹尾 明子, 蓬田 清
    • Organizer
      日本地球惑星科学連合 2023年大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 断層近傍の海底地震計・水圧計記録を用いた地震時変位波形の推定2023

    • Author(s)
      水谷 歩, Diego Delgar, 蓬田 清
    • Organizer
      日本地震学会 2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Estimation of coseismic seafloor displacement waveforms using collocated ocean-bottom pressure gauges and seismometers2023

    • Author(s)
      Ayumu Mizutani, Diego Delgar, Kiyoshi Yomogida
    • Organizer
      American Geophysical Union Fall Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] DONET・S-net水圧計を用いた津波バックプロジェクション解析:2022年1月15日のフンガ・トンガ-フンガ・ハアパイ火山噴火への適用2022

    • Author(s)
      水谷 歩、蓬田 清
    • Organizer
      日本地球惑星科学連合 2022年大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Development of seismic interferometry analysis for DAS data on a seafloor cable to determine shallow S-wave velocity structure with spatially high resolution2022

    • Author(s)
      福島 駿、篠原 雅尚、西田 究、竹尾 明子、山田 知朗、蓬田 清
    • Organizer
      日本地球惑星科学連合 2022年大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 補助関数を用いた非線形問題のパラメター最適化:波形インバージョンなどへの応用2022

    • Author(s)
      蓬田 清
    • Organizer
      日本地震学会 2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 2022年トンガ火山噴火に伴う津波の後続波:海底水圧計記録のアレイ解 析による励起源の推定2022

    • Author(s)
      水谷 歩、蓬田 清
    • Organizer
      日本地震学会 2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] DASと3成分地震計によるspatial autocorrelationの定式化と三陸沖海底 ケーブルデータへの適用2022

    • Author(s)
      福島 駿、篠原 雅尚、山田 知朗、西田 究、竹尾 明子、蓬田 清
    • Organizer
      日本地震学会 2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Source estimation of the tsunami later phases associated with the 2022 Tonga volcanic eruption2022

    • Author(s)
      A. Mizutani and K. Yomogida
    • Organizer
      American Geophysical Union Fall Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Extension of Seismic Interferometry for Marine DAS Data - Application of FK Filter and Formularization of SPAC Between DAS and Seismometer2022

    • Author(s)
      S. Fukushima, M.Shinohara, K. Nishida, A. Takeo, T. Yamada, and K. Yomogida
    • Organizer
      American Geophysical Union Fall Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 北海道の火山フロント周辺における地震波散乱・減衰構造の局所的変動2021

    • Author(s)
      蓬田清、益田英勝、椎名高裕、勝俣啓
    • Organizer
      日本地球惑星科学連合 2021年大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Attenuation contrast in mantle wedge across the volcanic front of NE Japan that controls propagations of high-frequency S-wave later phases2021

    • Author(s)
      Takahiro Shiina, Kei Katsumata, Kiyoshi Yomogida, and Aitaro Kato
    • Organizer
      日本地球惑星科学連合 2021年大会
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Real-time estimation of displacement, velocity and tsunami height with ocean-bottom pressure data using a Kalman filter and an Ensemble Empirical Mode Decomposition2021

    • Author(s)
      Ayumu Mizutani and Kiyoshi Yomogida
    • Organizer
      日本地球惑星科学連合 2021年大会
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 沈み込み帯の超巨大地震のalong-dipセグメントの要因2021

    • Author(s)
      蓬田清
    • Organizer
      日本地震学会 2021年度秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] S-net海底水圧記録を用いたバックプロジェクション法による津波波源の推定2021

    • Author(s)
      水谷歩、蓬田清
    • Organizer
      日本地震学会 2021年度秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 三陸沖光ケーブル観測システムのDistributed Acoustic Sensing データを用いたレイリー波位相速度の計測2021

    • Author(s)
      福島駿、篠原雅尚、山田知郎、西田究、竹尾明子、蓬田清
    • Organizer
      日本地震学会 2021年度秋季大会
    • Related Report
      2021 Research-status Report
  • [Remarks] 北海道大学理学研究院・地球惑星ダイナミクス分野・地震学研究室

    • URL

      https://www.sci.hokudai.ac.jp/seismolab/

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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