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Estimating the 3-D tectonic stress fields in and around the Japanese Islands

Research Project

Project/Area Number 18K03801
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 InstitutionNagoya University

Principal Investigator

Terakawa Toshiko  名古屋大学, 環境学研究科, 准教授 (30451826)

Project Period (FY) 2018-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords地震 / 応力場 / 弾性歪エネルギー / 応力インバージョン / 応力 / 間隙流体圧 / 地震のメカニズム解 / インバージョン解析 / ABIC / 断層強度 / 絶対応力
Outline of Final Research Achievements

We investigated the deviatoric stress magnitude of background stress fields before the 2016 Kumamoto earthquake sequence in Japan, based on the temporal changes in elastic strain energies caused by the mainshock (dE) and the coseismic stress rotation.We modelled six components of background stress fields from stress orientation together with the effective friction coefficients (m’ = 0.3, 0.15, 0.1, 0.05, 0.03), using the 3-D Mohr diagram. By combining coseismic stress changes fields with them, we also computed the absolute stress fields after the largest foreshock and the mainshock of the sequence. Considering the energy balance, dE must be larger than the radiated energy. We also examined the compatibility of the focal mechanisms of aftershocks with the stress fields after the mainshock. We concluded that that the effective friction coefficient in the crust is much larger than that estimated in previous studies
(m' < 0.1).

Academic Significance and Societal Importance of the Research Achievements

地震は地下に蓄えられた応力を断層運動により解放する物理過程であり,応力状態を把握することは地震の発生を理解するうえで重要である.しかし,応力は,直接測定することの難しい物理量であり,震源域の応力レベルに関しては統一的な見解が得られていない.本研究は,2016年熊本地震震源域を対象に,独自の視点により応力場を実効摩擦係数をパラメータとしてモデル化し,本震前後の様々な物理量の変化のモデル依存性と,観測データから得られる情報を手掛かりに,地震発生域の応力状態を推定することに成功した.推定した実効摩擦係数の値は,従来考えられてきたものより有意に大きいことが分かり,大きな進展をもたらした.

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (25 results)

All 2021 2020 2019 2018

All Journal Article (6 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (18 results) (of which Int'l Joint Research: 9 results,  Invited: 6 results) Book (1 results)

  • [Journal Article] Stress and pore fluid pressure control of seismicity rate changes following the 2016 Kumamoto earthquake, Japan2021

    • Author(s)
      Nakagomi Kodai、Terakawa Toshiko、Matsumoto Satoshi、Horikawa Shinichiro
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Issue: 1 Pages: 1-9

    • DOI

      10.1186/s40623-020-01329-5

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Three‐Dimensional Pore Fluid Pressures in Source Region of 2017 Pohang Earthquake Inferred From Earthquake Focal Mechanisms2020

    • Author(s)
      Terakawa Toshiko、Seo Wooseok、Kim Kwang‐Hee、Ree Jin‐Han
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 9 Pages: 1-16

    • DOI

      10.1029/2019gl085964

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Elastic strain energy and pore-fluid pressure control of aftershocks2020

    • Author(s)
      Terakawa Toshiko、Matsu'ura Mitsuhiro、Noda Akemi
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 535 Pages: 116103-116103

    • DOI

      10.1016/j.epsl.2020.116103

    • NAID

      120006883535

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The 3‐D Spatial Distribution of Shear Strain Energy Changes Associated With the 2016 Kumamoto Earthquake Sequence, Southwest Japan2020

    • Author(s)
      Noda Akemi、Saito Tatsuhiko、Fukuyama Eiichi、Terakawa Toshiko、Tanaka Sachiko、Matsu'ura Mitsuhiro
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 3 Pages: 1-9

    • DOI

      10.1029/2019gl086369

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Physical interpretation of moment tensor and the energetics of shear faulting2019

    • Author(s)
      Matsu’ura Mitsuhiro、Noda Akemi、Terakawa Toshiko
    • Journal Title

      Tectonophysics

      Volume: 771 Pages: 228228-228228

    • DOI

      10.1016/j.tecto.2019.228228

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Absolute Stress Fields in the Source Region of the 1992 Landers Earthquake2018

    • Author(s)
      Terakawa Toshiko、Hauksson Egill
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 123 Issue: 10 Pages: 8874-8890

    • DOI

      10.1029/2018jb015765

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 2016年熊本地震の余震発生における間隙流体圧の影響2020

    • Author(s)
      寺川 寿子・中込 広大・松本 聡・堀川 信一郎・熊本地震 合同地震観測グループ
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
  • [Presentation] 2016年熊本地震による地殻内せん断歪みエネルギー変化の定量評価:余震活動との関係2020

    • Author(s)
      野田 朱美・齊藤 竜彦・福山 英一・寺川 寿子・田中 佐千子・松浦 充宏
    • Organizer
      日本地震学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 2017年韓国浦項地震の発生メカニズムの考察2020

    • Author(s)
      寺川寿子・Wooseok Seo・Kwang-Hee Kim・Jin-Han Ree
    • Organizer
      日本地震学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Investigation on physical mechanisms of the 2017 Pohang earthquake, South Korea2020

    • Author(s)
      Toshiko Terakawa
    • Organizer
      2020 International Forum on Pohang Earthquake
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 1992年ランダース地震による弾性歪エネルギーの変化と余震の評価2019

    • Author(s)
      寺川寿子・松浦充宏・野田朱美
    • Organizer
      日本地球惑星連合大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 2016年熊本地震の余震発生における間隙流体圧の役割2019

    • Author(s)
      中込広大・寺川寿子・松本聡・大倉敬宏・今西和俊・吉見雅行・内出崇彦・2016年 熊本地震合同地震観測グループ
    • Organizer
      日本地震学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 弾性歪エネルギーに基づく地震破壊規準による余震の評価2019

    • Author(s)
      寺川寿子・松浦充宏・野田朱美
    • Organizer
      日本地震学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] The change in the elastic strain energy due to the 1992 Landers earthquake and triggering mechanisms of aftershock activity2019

    • Author(s)
      Terakawa, T., M. Matsu’ura, and A. Noda
    • Organizer
      11th International Workshop on Statistical Seismology (StatSei11)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 3D pore fluid pressures in the source region of the 2017 Pohang earthquake inferred from earthquake focal mechanism2019

    • Author(s)
      Terakawa, T
    • Organizer
      International Symposium on Pohang Earthquake
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Elastic strain energy and pore-fluid pressure controlling aftershocks2019

    • Author(s)
      Terakawa, T., M. Matsu’ura, and A. Noda
    • Organizer
      AGU 2019 Fall Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Statistical data analysis for earthquake physics2019

    • Author(s)
      Terakawa, T.
    • Organizer
      Statsei11 pre-workshop tutorials by the Community Online Resource of Statistical Seismicity Analysis (CORSSA)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Modeling and Estimating the 3D Absolute Stress Field Using Earthquake Focal Mechanism Solutions2019

    • Author(s)
      Terakawa, T., and E. Hauksson
    • Organizer
      The Second International Symposium on Crustal Dynamics (ISCD-2)-Toward integrated view of island arc seismogenesis
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 1992年ランダース地震震源域の絶対応力場2018

    • Author(s)
      寺川寿子・Egill Hauksson
    • Organizer
      日本地球惑星連合大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 3D tectonic stress stress field in and around Japan inferred from CMT data inversion2018

    • Author(s)
      Toshiko Terakawa
    • Organizer
      AOGS
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Roles of tectonic stress and pore fluid pressure in earthquake generation2018

    • Author(s)
      Toshiko Terakawa
    • Organizer
      2nd Asia-Pacific Workshop on Lithosphere and Mantle Dynamics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 間隙流体圧をパラメータとした絶対応力場のモデル化と推定2018

    • Author(s)
      寺川寿子
    • Organizer
      東濃地震科学研究所・平成30年度第1回地殻活動研究委員会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 3D Absolute Stress Fields in the Source Region of the 1992 Landers Earthquake2018

    • Author(s)
      Terakawa, T., and E. Hauksson
    • Organizer
      AGU 2018 Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 1992年ランダース地震震源域の絶対応力場2018

    • Author(s)
      寺川寿子・Egill Hauksson
    • Organizer
      日本地震学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Book] 図説地球科学の事典2018

    • Author(s)
      鳥海光弘、入舩徹男、岩森光、ウォリスサイモン、小平秀一、小宮剛、阪口秀、鷺谷威、末次大輔、中川貴司、宮本英昭(分担執筆)
    • Total Pages
      248
    • Publisher
      朝倉書店
    • ISBN
      9784254160727
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2025-01-30  

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