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An experimental study on faulting in peridotite under the pressure-temperature conditions of subducting slabs

Research Project

Project/Area Number 16H04077
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionEhime University

Principal Investigator

Ohuchi Tomohiro  愛媛大学, 地球深部ダイナミクス研究センター, 講師 (60570504)

Co-Investigator(Kenkyū-buntansha) 雷 興林  国立研究開発法人産業技術総合研究所, 地質調査総合センター, 研究グループ長 (70358357)
GREAUX Steeve  愛媛大学, 地球深部ダイナミクス研究センター, 特定研究員 (90543166)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2016: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Keywords稍深発地震 / 深発地震 / アコースティックエミッション / スラブ / 水 / 断熱不安定 / 断層 / ダナイト / ハルツバーガイト / サイレント地震 / 微小破壊音 / カンラン岩 / 細粒化 / カンラン石 / 地震予知 / D-DIA型変形装置 / スラブ内地震 / 高圧力 / その場観察実験
Outline of Final Research Achievements

To understand the processes of the occurrence of intermediate-depth and deep earthquakes, we conducted uniaxial deformation experiments on dunite at pressures 1-17 GPa and temperatures 500-1000 degC using a D-DIA apparatus. Our acoustic emission (AE) monitoring system and the anvils were also optimized for the deformation experiments. We found that “silent” faulting proceeds in dunite samples under undrained conditions. On the other hand, many AEs radiated from the dunite samples during the occurrence of faulting under drained conditions. Microstructural observations revealed that the hydration reaction of minerals on the fault surface suppressed the radiation of AEs. In summary, aqueous fluid in/around the subducting slabs may inhibit the occurrence of intermediate-depth earthquakes.

Academic Significance and Societal Importance of the Research Achievements

日本列島をはじめとした、沈み込み帯の深さ30-150kmにて頻発する稍深発地震の発生メカニズムを実験的に解明した。プレートの岩石の一部分に『変形のエネルギー』が局所的に集中することで、部分的に岩石が溶融し、その結果岩石の強度が大幅に低下し断層形成及び地震発生に至るということを明らかにした。この発見により、「稍深発地震は地球深部水によって誘発される」といった従来の説が覆された。加えて、稍深発地震の発生は水性流体が存在することによって抑制される可能性があることも実験的に示した。この結果は今後の追加実験を要するものの、この原理が確かであれば、将来的には防災への応用が期待される。

Report

(4 results)
  • 2019 Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (17 results)

All 2018 2017 2016

All Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (11 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Semi-brittle behavior of wet olivine aggregates: the role of aqueous fluid in faulting at upper mantle pressures2018

    • Author(s)
      T. Ohuchi, X. Lei, Y. Higo, Y. Tange, T. Sakai, K. Fujino
    • Journal Title

      Contributions to Mineralogy and Petrology

      Volume: 173 Issue: 10 Pages: 88-88

    • DOI

      10.1007/s00410-018-1515-9

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Deformation-induced crystallographic-preferred orientation of hcp-iron: An experimental study using a deformation-DIA apparatus2018

    • Author(s)
      Nishihara Yu、Ohuchi Tomohiro、Kawazoe Takaaki、Seto Yusuke、Maruyama Genta、Higo Yuji、Funakoshi Ken-ichi、Tange Yoshinori、Irifune Tetsuo
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 490 Pages: 151-160

    • DOI

      10.1016/j.epsl.2018.03.029

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Oxidation softens mantle rocks2018

    • Author(s)
      Irifune Tetsuo、Ohuchi Tomohiro
    • Journal Title

      Nature

      Volume: 555 Issue: 7696 Pages: 314-315

    • DOI

      10.1038/d41586-018-02828-y

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Flow behavior and microstructures of hydrous olivine aggregates at upper mantle pressures and temperature2017

    • Author(s)
      Ohuchi, T., Kawazoe, T., Higo, Y., Suzuki, A.
    • Journal Title

      Contrib. Mineral. Petrol.

      Volume: 172 Pages: 65-65

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Intermediate-depth earthquakes linked to localized heating in dunite and harzburgite2017

    • Author(s)
      Tomohiro Ohuchi, Xinglin Lei, Hiroaki Ohfuji, Yuji Higo, Yoshinori Tange, Takeshi Sakai, Kiyoshi Fujino, Tetsuo Irifune
    • Journal Title

      Nature Geoscience

      Volume: 10 Issue: 10 Pages: 771-771

    • DOI

      10.1038/ngeo3011

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Creep strength of ringwoodite measured at pressure-temperature conditions of the lower part of the mantle transition zone using a deformation-DIA apparatus2016

    • Author(s)
      T. Kawazoe, Y. Nishihara, T. Ohuchi, N. Miyajima, G. Maruyama, Y. Higo, K. Funakoshi, and T. Irifune, T.
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 454 Pages: 10-19

    • DOI

      10.1016/j.epsl.2016.08.011

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Faulting in deforming dunite under wet conditions: role of aqueous fluid in semi-brittle behavior of dunite2018

    • Author(s)
      Ohuchi, T., Lei, X., Higo, Y., Tange, Y.
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Deformation of quartz single crystals under the coesite-stable conditions2018

    • Author(s)
      Kawakami, R., Ohuchi, T.
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High pressure generation up to 24 gigapascals using a D-DIA apparatus combined with jacketed anvils2018

    • Author(s)
      大内智博
    • Organizer
      日本地球惑星連合2018年大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ハルツバーガイトの半脆性流動と破壊における水の効果2018

    • Author(s)
      大内智博,雷興林,肥後祐司,丹下慶範,境毅
    • Organizer
      第59回高圧討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 高温高圧下における微小破壊音測定:稍深発・深発地震発生の素過程の解明を目指して2018

    • Author(s)
      大内智博
    • Organizer
      第59回高圧討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] High pressure generation up to 24 gigapascals using a D-DIA apparatus combined with jacketed anvils.2018

    • Author(s)
      Ohuchi, T.
    • Organizer
      Core Mantle Evolution International Symposium and FY2017 Annual General Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Shear localization in peridotites and the occurrence of intermediate-depth earthquakes2017

    • Author(s)
      Ohuchi, T., Lei, X., Ohfuji, H., Higo, Y., Tange, Y., Sakai, T., Fujino, K., Irifune, T.
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スラブ内浅部条件下における含水カンラン岩の変形実験2017

    • Author(s)
      大内智博,雷興林,肥後祐司,丹下慶範
    • Organizer
      日本鉱物科学会2017年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Toward the in-situ deformation experiments under the lower mantle conditions using D-DIA apparatus2017

    • Author(s)
      大内智博,八木健彦
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Annual Research Report
  • [Presentation] Semibrittle flow of olivine aggregates under the conditions of subducting slab.2016

    • Author(s)
      Ohuchi, T., Lei, X., Higo, Y., Tange, Y., Irifune, T.
    • Organizer
      Japan Geoscience Union Meeting 2016
    • Place of Presentation
      幕張メッセ(千葉県・幕張)
    • Year and Date
      2016-05-24
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 上部マントルの温度圧力条件下におけるアコースティックエミッション測定に関する技術開発2016

    • Author(s)
      大内智博,雷興林,肥後祐司,丹下慶範,入舩徹男
    • Organizer
      日本地球惑星連合2016年大会
    • Place of Presentation
      幕張メッセ(千葉県・幕張)
    • Year and Date
      2016-05-22
    • Related Report
      2016 Annual Research Report

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

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