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Study on spatial variations of aseismic slips inferred from systematic analyses of geodetic and seismic data

Research Project

Project/Area Number 19K14809
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Takagi Ryota  東北大学, 理学研究科, 助教 (10735963)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsスロースリップ / 沈み込み帯 / 地震波速度構造 / S-net / 常時微動トモグラフィー / スロー地震 / 海底地震観測 / 3次元S波速度構造 / 日本海溝 / 地震波干渉法 / 表面波トモグラフィー / 常時微動 / 日本海溝沈み込み帯 / プレート境界 / 表面波 / プレート境界地震 / 相模トラフ / フィリピン海プレート / 非地震性すべり / 地殻変動
Outline of Research at the Start

間欠的な非地震性すべりであるスロースリップの発生様式は場所により変化する。本研究ではスロースリップ発生メカニズムの理解のため、スロースリップ発生様式の空間変化の要因解明を目的とする。そのために、地殻変動データ解析に基づき、日本のプレート境界で発生する様々な時定数のスロースリップを系統的に検出し、スロースリップの各種震源パラメータの空間分布を明らかにする。また、地震波形データ解析に基づき、スロースリップ発生域におけるプレート境界周辺の地震波速度構造を推定する。スロースリップの各種震源パラメータと地震波速度構造の系統的な比較により、スロースリップ発生様式の空間変化や地域性の要因を解明する。

Outline of Final Research Achievements

In order to understand spatial variations of episodic slow slip events, we estimated the spatial variations of slow slip activity and seismic velocity structure around slow slip source areas from geodetic and seismic data, respectively. Systematic analysis of GNSS continuous data revealed along-strike variations in characteristics of slow slip events on the Philippine Sea Plate off the Kanto area. We developed ambient noise cross-correlation analysis and ambient noise surface wave tomography for application to ocean-bottom seismic networks. We successfully estimated a three-dimensional shear velocity structure around the plate interface along the Japan Trench.

Academic Significance and Societal Importance of the Research Achievements

プレート境界で発生するスロースリップの発生様式は空間的に変化するが、詳細な空間分布やその原因は未解明な点が多い。本研究では、陸上の地殻変動観測網のデータや近年設置された海底地震観測網のデータを有効活用することで、スロースリップ発生様式の空間変化とプレート境界周辺の地震波速度構造を推定した。以上から両者の比較検討が可能になり、スロースリップの空間変化の原因解明や地震準備過程の理解につながると期待される。また、本研究の中で開発した手法や得られた結果は、最先端の海底地震観測網のデータ利活用を促進させ、沈み込み帯における地震やスロースリップの発生機構に関する新たな知見の創出に貢献できると考えられる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (21 results)

All 2022 2021 2020 2019

All Journal Article (9 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 9 results,  Open Access: 7 results) Presentation (12 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Journal Article] Short‐Term and Long‐Term Variations in Seismic Velocity at Shallow Depths of the Overriding Plate West of the Japan Trench2022

    • Author(s)
      Tonegawa T.、Takagi R.、Sawazaki K.、Shiomi K.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 128 Issue: 1

    • DOI

      10.1029/2022jb025262

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Multimode dispersion measurement of surface waves extracted by multicomponent ambient noise cross-correlation functions2022

    • Author(s)
      Takagi Ryota、Nishida Kiwamu
    • Journal Title

      Geophysical Journal International

      Volume: 231 Issue: 2 Pages: 1196-1220

    • DOI

      10.1093/gji/ggac225

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Global Centroid Single Force Catalog of P‐Wave Microseisms2022

    • Author(s)
      Nishida Kiwamu、Takagi Ryota
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 127 Issue: 4

    • DOI

      10.1029/2021jb023484

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Prevalence of updip rupture propagation in interplate earthquakes along the Japan trench2022

    • Author(s)
      Keisuke Yoshida, Naoki Uchida, Hisahiko Kubo, Ryota Takagi, Shiqing Xu,
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 578 Pages: 117306-117306

    • DOI

      10.1016/j.epsl.2021.117306

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Receiver Function Imaging of the Amphibious NE Japan Subduction Zone--Effects of Low-Velocity Sediment Layer2021

    • Author(s)
      HyeJeong Kim, Hitoshi Kawakatsu, Takeshi Akuhara, Masanao Shinohara, Hajime Shiobara, Hiroko Sugioka, Ryota Takagi
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 126 Issue: 9

    • DOI

      10.1029/2021jb021918

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [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] Migration of shallow and deep slow earthquakes toward the locked segment of the Nankai megathrust2020

    • Author(s)
      Naoki Uchida, Ryota Takagi, Youichi Asano, Kazushige Obara
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 531 Pages: 115986-115986

    • DOI

      10.1016/j.epsl.2019.115986

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Estimation of the Orientations of the S‐net Cabled Ocean‐Bottom Sensors2019

    • Author(s)
      Ryota Takagi, Naoki Uchida, Takashi Nakayama, Ryosuke Azuma, Akira Ishigami, Tomomi Okada, Takeshi Nakamura, Katsuhiko Shiomi
    • Journal Title

      Seismological Research Letters

      Volume: 90 Issue: 6 Pages: 2175-2187

    • DOI

      10.1785/0220190093

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Coseismic changes in subsurface structure associated with the 2018 Hokkaido Eastern Iburi Earthquake detected using autocorrelation analysis of ambient seismic noise2019

    • Author(s)
      Ikeda Hiroki、Takagi Ryota
    • Journal Title

      Earth, Planets and Space

      Volume: 71 Issue: 1 Pages: 1-11

    • DOI

      10.1186/s40623-019-1051-5

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 常時微動トモグラフィーによる日本海溝・千島海溝沿い前弧海域下の3次元S波速度構造2022

    • Author(s)
      高木涼太、西田究
    • Organizer
      日本地震学会2022年度秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 常時微動トモグラフィーによる日本海溝沈み込み帯浅部の3次元S波速度構造推定2022

    • Author(s)
      高木涼太、西田究
    • Organizer
      東京大学地震研究所共同利東京大学地震研究所共同利用研究集会 「陸海両域での超高密度観測時代の観測・解析手法と地震波伝播理論の新展開」
    • Related Report
      2022 Annual Research Report
  • [Presentation] Ambient noise tomography in the offshore forearc region along the Japan trench using S-net data2021

    • Author(s)
      Ryota Takagi, Kiwamu Nishida
    • Organizer
      2021 JpGU Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 地震・地殻変動多点連続観測データに基づく地球内部広帯域変動現象の研究2021

    • Author(s)
      高木涼太
    • Organizer
      日本地震学会2021 年度秋季大会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Seismic velocity structure along the Japan trench inferred from ambient noise and teleseismic surface waves observed by S-net2020

    • Author(s)
      Ryota Takagi, Akira Ishigami, Genti Toyokuni, Ryosuke Azuma, Mare Yamamoto
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] S-netを用いた東北日本前弧海域における常時微動トモグラフィー2020

    • Author(s)
      高木涼太、西田究
    • Organizer
      日本地震学会2020年度秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Detection of slow slip events on the Philippine Sea plate beneath the Kanto region2020

    • Author(s)
      Ryota Takagi, Naoki Uchida, Kazushige Obara
    • Organizer
      Slow Earthquake Workshop 2020 Virtual
    • Related Report
      2020 Research-status Report
  • [Presentation] S-netデータを用いた東北日本前弧海域における常時微動トモグラフィー2020

    • Author(s)
      高木涼太、西田究
    • Organizer
      研究集会「固体地球の多様な波動現象へのアプローチ: 多量データ解析と大規模計算を両輪に」
    • Related Report
      2020 Research-status Report
  • [Presentation] Investigations of sensor orientation and a possibility of detecting crustal deformation based on accelerometer records of S-net2019

    • Author(s)
      Ryota Takagi, Naoki Uchida, Takashi Nakayama, Ryosuke Azuma, Akira Ishigami, Tomomi Okada, Yusaku Ohta, Ryota Hino
    • Organizer
      JpGU Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] S-netを用いた常時微動相互相関解析2019

    • Author(s)
      高木涼太、豊国源知、山本希
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 関東地方におけるスロースリップイベントの系統的検出の試み2019

    • Author(s)
      高木涼太、内田直希、小原一成
    • Organizer
      日本地震学会2019年度秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Systematic detection of slow slip events beneath Kanto, Japan2019

    • Author(s)
      Ryota Takagi, Naoki Uchida, Kazushige Obara
    • Organizer
      International Joint Workshop on Slow Earthquakes 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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