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Spatial variation of S-wave reflection efficiency on plate boundary associated with long-term slow slip events

Research Project

Project/Area Number 17K05637
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionBuilding Research Institute (2018-2019)
Hiroshima University (2017)

Principal Investigator

Kita Saeko  国立研究開発法人建築研究所, 国際地震工学センター, 主任研究員 (10543449)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsゆっくりすべり / スロースリップ / セグメント境界 / スラブ内地震 / b値 / 含水量 / 石英脈 / 紀伊半島 / スロー地震 / 短期的スロースリップ / b値 / 長期的スロースリップ / 西南日本 / マントルウエッジ / 減衰構造 / 反射波 / 反射効率 / プレート境界
Outline of Final Research Achievements

In order to search the spatial change in the reflection efficiency of the S wave reflected at the plate boundary, I firstly examined characteristics of earthquakes on the Kii Peninsula in southwestern Japan. I found that the b-value of the seismic activity both in the slab and overlying plate greatly changed at the line connecting Owase City in Mie Prefecture and Sakai City in Osaka Prefecture. This boundary line across the Kii Peninsula corresponds to the segment boundary of deep low-frequency tremor (short-term slow slip). In addition, the b-value of the intraslab earthquakes changed at the times of the occurrence of short-term slow slip.

Academic Significance and Societal Importance of the Research Achievements

本研究の研究成果は,スロースリップの発生様式はスラブ内地震の地震活動の時空間変化と非常に密接に関わることを示唆している.スロースリップをはじめとしたスロー地震現象は,巨大地震発生の準備過程に深く関わることが, 数値シミュレーション研究から予想されている.本研究は,巨大地震の準備過程についてモニタリングする手法として,スラブ内地震の地震活動の時空間変化の把握が使えるかもしれないことを見出したと言える.

Report

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

    (27 results)

All 2019 2018 2017 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (16 results) (of which Int'l Joint Research: 6 results,  Invited: 3 results) Remarks (2 results) Funded Workshop (2 results)

  • [Int'l Joint Research] 南カリフォルニア大学/カリフォルニア大学サンディエゴ校(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] 南カリフォルニア大学/シカゴ大学/カーネギ研究所(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] ENS(フランス)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] ハーバード大学/ワシントン大学/南カルフォルニア大学(米国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Characteristics of relocated hypocenters of the 2018 M6.7 Hokkaido Eastern Iburi earthquake and its aftershocks with a three-dimensional seismic velocity structure2019

    • Author(s)
      Kita Saeko
    • Journal Title

      Earth, Planets and Space

      Volume: 71 Issue: 1 Pages: 71-122

    • DOI

      10.1186/s40623-019-1100-0

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Physical mechanisms of oceanic mantle earthquakes: Comparison of natural and experimental events2018

    • Author(s)
      Kita Saeko、Ferrand Thomas P.
    • Journal Title

      Scientific Reports

      Volume: 8 Issue: 1 Pages: 1-11

    • DOI

      10.1038/s41598-018-35290-x

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Temporal variation of intermediate-depth earthquakes around the time of the M 9.0 Tohoku-oki earthquake2017

    • Author(s)
      Delbridge, B. G., S. Kita, N. Uchida, C. W. Johnson, T. Matsuzawa, and R. Burgmann
    • Journal Title

      Geophys. Res. Lett.

      Volume: 44(8) Issue: 8 Pages: 3580-3590

    • DOI

      10.1002/2017gl072876

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Effect of episodic slow slip on oceanic slab stress state and seismicity near a subduction-zone megathrust, beneath Kii peninsula, southwestern Japan2019

    • Author(s)
      Kita,S., H. Houston, S. Tanaka, Y. Asano, T. Shibutani and N. Suda
    • Organizer
      2020 AGU Fall Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Interactions between intraslab seismicity and ETS beneath Kii peninsula, controlled by fluid migration2019

    • Author(s)
      Kita,S., H. Houston, S. Tanaka, Y. Asano, T. Shibutani and N. Suda
    • Organizer
      スロー地震学研究集会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Interactions between the intraslab earthquakes and episodic slow slips beneath Kii Peninsula controlled by fluid migration2019

    • Author(s)
      Kita,S., H. Houston, S. Tanaka, Y. Asano, T. Shibutani and N. Suda
    • Organizer
      日本地震学会秋季大会2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 紀伊半島下フィリピン海スラブ内におけるスロースリップ発生前後の地震活動度、応力場、およびb値の変化2019

    • Author(s)
      Kita,S., H. Houston, S. Tanaka, Y. Asano, T. Shibutani and N. Suda
    • Organizer
      日本地球惑星科学連合2019年春季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Comparison of experimental and intermediate-depth earthquake b-value: difference in hydration degree of the oceanic mantle between Tohoku and Hokkaido2019

    • Author(s)
      Kita, S. and T. Ferrand
    • Organizer
      日本地球惑星科学連合2019年春季大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Physical mechanism of oceanic mantle earthquakes: Comparison of b-values of natural and lab earthquakes.2018

    • Author(s)
      Saeko Kita and Thomas Pascal Ferrand
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Dehydration-Driven Stress Transfer Evidenced Beneath NE Japan2018

    • Author(s)
      Saeko Kita and Thomas Pascal Ferrand
    • Organizer
      AOGS2018 meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spatial distribution and b-values of earthquakes beneath Kii Peninsula, southwestern Japan2018

    • Author(s)
      広瀬 勇樹・北佐枝子
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 胆振東部地域下における三次元速度構造を用いたDD法による震源再決定2018

    • Author(s)
      北佐枝子
    • Organizer
      日本地震学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Variations in seismicity rate, stress orientations and b-values before and after ETS events in the subducting slab beneath Kii Peninsula2018

    • Author(s)
      Saeko Kita and Heidi Houston
    • Organizer
      International Joint Workshop on Slow Earthquakes 2018
    • Related Report
      2018 Research-status Report
  • [Presentation] Dehydration-driven stress transfer: from the lab to the field2018

    • Author(s)
      Thomas Pascal Ferrand,Alexandre Schubnel,Nadge Hilairet,Loc Labrousse,Saeko Kita
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Variations in b-values and stress orientations in the subducting slab under Kii peninsula2018

    • Author(s)
      北 佐枝子, Heidi Houston, 田中佐千子, 浅野陽一,澁谷拓朗,須田直樹
    • Organizer
      日本地震学会2018年度秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Temporal variation of intermediate-depth earthquakes around the time of the M 9.0 Tohoku-oki earthquake2017

    • Author(s)
      Delbridge, B.G., S. Kita, C. Johnson, N. Uchida, T. Matsuzawa, R. Burgmann
    • Organizer
      2017 AGU-JpGU joint meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Characteristics of the stress drops for intralslab earthquakes beneath Tohoku and Hokkaido, northeastern Japan2017

    • Author(s)
      Kita, S. and T. Shiina
    • Organizer
      2017 AGU-JpGU joint meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] The depth variations in seismic velocity and intermediate-depth seismicity in the subducting crust of the Pacific slab2017

    • Author(s)
      椎名 高裕, 中島 淳一, 松澤 暢, 豊国 源知, 北 佐枝子
    • Organizer
      2017 AGU-JpGU joint meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 西南日本の地震波減衰構造とスロー地震.-地震テクトニクス 的な検討-2017

    • Author(s)
      北佐枝子・松原誠・澁谷拓郎
    • Organizer
      日本地質学会第 124 年学術大会(2017 愛媛大会)
    • Related Report
      2017 Research-status Report
    • Invited
  • [Remarks] 建築研究所 国際地震工学センター 北佐枝子 ホームページ

    • URL

      https://sites.google.com/view/kitasaeko/publications

    • Related Report
      2018 Research-status Report
  • [Remarks] 建築研究所HP

    • URL

      http://home.hiroshima-u.ac.jp/~saeko/paper.html

    • Related Report
      2017 Research-status Report
  • [Funded Workshop] Intraslab and intraplate earthquakes(日本地球惑星科学連合の国際セッションS-CG50として)2019

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] 国際学会の役割も担う2018年日本地球惑星科学連合春季大会にて,国際セッション(スラブ内地震, S-CG52)を代表コンビナーとして開催した2018

    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2022-02-21  

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