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Development on analysis and observation method of slow slip events in southwest Japan, considering duration

Research Project

Project/Area Number 16K05536
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionKyoto University

Principal Investigator

Nishimura Takuya  京都大学, 防災研究所, 准教授 (90370808)

Co-Investigator(Kenkyū-buntansha) 松澤 孝紀  国立研究開発法人防災科学技術研究所, 地震津波火山ネットワークセンター, 主任研究員 (90500744)
木村 武志  国立研究開発法人防災科学技術研究所, 地震津波火山ネットワークセンター, 主任研究員 (10563520)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywordsスロースリップイベント / スロー地震 / GNSS / 地殻変動 / 南海トラフ / SSE / 測地 / 地震 / 自然現象観測・予測
Outline of Final Research Achievements

We applied multiple methods to detect short-term slow slip events (SSEs) along the Nankai Trough and estimate their fault model using GNSS data. We clarified spatio-temporal distribution of SSEs and their characteristics. GNSS data enabled us to estimate duration and slip migration of a large SSE with a moment magnitude of >6. Duration of detected short-term SSEs is long around Kii Channel, Tokai region, and central Shikoku. Although it is difficult to detect all episodes for smaller SSEs separately, stacking of daily displacement on dates of intense tremor activity successfully produces cumulative displacement of SSEs, which can be used to estimate total slip.

Academic Significance and Societal Importance of the Research Achievements

南海トラフ沿いに発生するSSEは、ノイズレベルと同程度の微小な現象であり、その特徴は十分わかっていなかった。本研究によって、M6を超えるようなSSEについては、GNSSデータからすべり分布の移動や継続時間を推定可能であることが示され、短期的SSEの継続時間に地域性が見られることや長期的なモーメント解放速度のゆらぎが明らかになった。また、個々のイベントは検出できない規模の小さなSSEについても累積の変位を検出することに初めて成功し、将来発生する南海トラフ沿いの巨大地震震源域周辺の断層すべり特性に関する知見が得られた。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (30 results)

All 2019 2018 2017 2016 Other

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 6 results) Presentation (20 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results) Remarks (3 results)

  • [Journal Article] The slow earthquake spectrum in the Japan Trench illuminated by the S-net seafloor observatories2019

    • Author(s)
      Nishikawa T.、Matsuzawa T.、Ohta K.、Uchida N.、Nishimura T.、Ide S.
    • Journal Title

      Science

      Volume: 365 Issue: 6455 Pages: 808-813

    • DOI

      10.1126/science.aax5618

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Detection of small crustal deformation caused by slow slip events in southwest Japan using GNSS and tremor data2019

    • Author(s)
      Fujita Megumi、Nishimura Takuya、Miyazaki Shin’ichi
    • Journal Title

      Earth, Planets and Space

      Volume: 71 Issue: 1 Pages: 1-13

    • DOI

      10.1186/s40623-019-1075-x

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spatiotemporal Evolution of Long‐ and Short‐Term Slow Slip Events in the Tokai Region, Central Japan, Estimated From a Very Dense GNSS Network During 2013?20162019

    • Author(s)
      Sakaue Hiromu、Nishimura Takuya、Fukuda Jun'ichi、Kato Teruyuki
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 124 Issue: 12 Pages: 13207-13226

    • DOI

      10.1029/2019jb018650

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Migrations and Clusters of Shallow Very Low Frequency Earthquakes in the Regions Surrounding Shear Stress Accumulation Peaks Along the Nankai Trough2019

    • Author(s)
      Takemura, S. A. Noda, T. Kubota, Y. Asano, T. Matsuzawa, K. Shiomi
    • Journal Title

      Geophysical Research Letters

      Volume: 46 Issue: 21 Pages: 11830-11840

    • DOI

      10.1029/2019gl084666

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of Slow Earthquake Database2018

    • Author(s)
      Kano, M., N. Aso, S. Annoura, R. Arai, K. Chao, K. Heki, S. Itaba, Y. Ito, N. Kamaya, T. Maeda, J. Maury, M. Nakamura, T. Nishimura, K. Obana, H. Sugioka, R. Takagi, T. Takahashi, A. Takeo, Y. Tu, N. Uchida, Y. Yamashita, T. Matsuzawa, S. Ide and K. Obara
    • Journal Title

      Seismol. Res. Lett.

      Volume: 89(4) Issue: 4 Pages: 1566-1575

    • DOI

      10.1785/0220180021

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Centroid Moment Tensor Inversion of Shallow Very Low Frequency Earthquakes Off the Kii Peninsula, Japan, Using a Three-Dimensional Velocity Structure Model2018

    • Author(s)
      Takemura Shunsuke、Matsuzawa Takanori、Kimura Takeshi、Tonegawa Takashi、Shiomi Katsuhiko
    • Journal Title

      Geophysical Research Letters

      Volume: 45 Issue: 13 Pages: 6450-6458

    • DOI

      10.1029/2018gl078455

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temporal activity modulation of deep very low frequency earthquakes in Shikoku, southwest Japan2018

    • Author(s)
      Satoru Baba, Akiko Takeo, Kazushige Obara, Aitaro Kato, Takuto Maeda, and Takanori Matsuzawa
    • Journal Title

      Geophys. Res. Lett.

      Volume: 45 Issue: 2 Pages: 733-738

    • DOI

      10.1002/2017gl076122

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] GNSSデータを用いた1997-2017年東海地方スロースリップイベントの推定2019

    • Author(s)
      坂上 啓、西村卓也、福田淳一、加藤照之
    • Organizer
      地球惑星科学連合2019年連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Revealing the slow earthquake activity in the Japan Trench and its relation to the 2011 Tohoku-Oki earthquake2019

    • Author(s)
      西川 友章、松澤 孝紀、太田 和晃、内田 直希、西村 卓也、井出 哲
    • Organizer
      地球惑星科学連合2019年連合大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Complementary distribution between SSEs and LFTs in the Ibaraki-oki and the Boso-oki regions along the Japan trench2019

    • Author(s)
      T. Nishimura
    • Organizer
      スロー地震国際合同研究集会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 四国地方における3 成分GNSS データを用いた短期的SSE の検出と継続期間の推定2019

    • Author(s)
      岡田悠太郎、西村卓也
    • Organizer
      日本測地学会第132回講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] GNSS 連続観測に基づく1997-2017 年東海地方スロースリップイベントの推定2019

    • Author(s)
      坂上 啓、西村卓也、福田淳一、加藤照之
    • Organizer
      日本測地学会第132回講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] An attempt to detect small crustal deformation caused by ETS in southwest Japan, using GNSS data2018

    • Author(s)
      Megumi Fujita, Takuya Nishimura, and Shin'ichi Miyazaki
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 東海地方スロースリップイベント2018

    • Author(s)
      坂上 啓・西村 卓也・福田 淳一・加藤 照之
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] GNSSとGPS-Aデータから推定された南海トラフ沿いのプレート間カップリングと内陸変動2018

    • Author(s)
      西村 卓也・横田 裕輔・田所 敬一・落 唯史
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 1997-2010年における東海地方スロースリップイベントの時空間発展の推定2018

    • Author(s)
      坂上 啓・西村 卓也・福田 淳一・加藤 照之
    • Organizer
      日本測地学会第130回講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 西村卓也・山崎健一・山下裕亮・小松信太郎2018

    • Author(s)
      日向灘沿岸における GNSS 観測網の構築と観測結果 (序報)
    • Organizer
      日本測地学会第130回講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] An attempt to detect small crustal deformation associated with stress release caused by ETS in southwest Japan, using GNSS data2018

    • Author(s)
      Megumi Fujita, Takuya Nishimura and Shin'ichi Miyazaki
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interplate coupling and slow slip events along the northern margin of the Philippine Sea plate estimated from GNSS data2017

    • Author(s)
      Takuya Nishimura
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Estimation of the spatiotemporal evolution of the slow slip events in the Tokai region, central Japan, since 2013 using GNSS data2017

    • Author(s)
      Sakaue, H., J. Fukuda, T. Kato, and T. Nishimura
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Quality control of tilt and strain data for automated detection of slow slip events within the Nankai subduction zone, Japan2017

    • Author(s)
      Takeshi Kimura, Satoshi Itaba, Takanori Matsuzawa, and Hisanori Kimura
    • Organizer
      JpGU-AGU2017 Joint Meeting Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Construction of short-term slow slip event catalog dtected automatically from tilt and strain data within the Nankai subduction zone, Japan2017

    • Author(s)
      Takeshi Kimura, Satoshi Itaba, Takanori Matsuzawa, and Hisanori Kimura
    • Organizer
      Joint Scientific Assemlbly of International Association of Geodecy and International Association of Seismology and Physics of the Earth's Interior
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 1994年から2016年に東海地方で発生したスロースリップイベントの時空間発展の推定2017

    • Author(s)
      坂上啓・西村卓也・福田淳一・加藤照之
    • Organizer
      日本地震学会2017年度秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 傾斜・ひずみデータの統合解析に基づく西南日本の短期的SSEカタログ2017

    • Author(s)
      木村武志・板場智史・松澤孝紀・木村尚紀
    • Organizer
      日本地震学会2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Estimation of the spatiotemporal evolution of slow slip events in the Tokai region, central Japan, during 1994 - 2016 using GNSS data2017

    • Author(s)
      Hiromu Sakaue, Takuya Nishimura, Junichi Fukuda, and Teruyuki Kato
    • Organizer
      AGU falll meeting 2017
    • Related Report
      2017 Research-status Report
  • [Presentation] Preliminary result on detecting short-term SSEs in the Mexican subduction zone2016

    • Author(s)
      T. Nishimura and C. Kostoglodov
    • Organizer
      Joint Workshop on Slow Earthquakes 2016
    • Place of Presentation
      東京大学地震研究所(東京都文京区)
    • Year and Date
      2016-09-14
    • Related Report
      2016 Research-status Report
  • [Presentation] Short-term Slow Slip Events in the Kanto Region, Central Japan Detected Using GNSS Data2016

    • Author(s)
      Takuya Nishimura
    • Organizer
      日本地球惑星科学連合2016年連合大会
    • Place of Presentation
      幕張メッセ国際会議場(千葉市)
    • Year and Date
      2016-05-22
    • Related Report
      2016 Research-status Report
  • [Remarks] 西村卓也Webページ

    • URL

      http://www1.rcep.dpri.kyoto-u.ac.jp/~nishimura/index.html

    • Related Report
      2019 Annual Research Report
  • [Remarks] 西村卓也Webpage

    • URL

      http://www1.rcep.dpri.kyoto-u.ac.jp/~nishimura/index.html

    • Related Report
      2018 Research-status Report
  • [Remarks] 西村卓也

    • URL

      http://www1.rcep.dpri.kyoto-u.ac.jp/~nishimura/index.html

    • Related Report
      2017 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2021-02-19  

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