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Elasticity and anelasticity of polycrystalline material containing dislocations; toward understanding of seismic images in the mantle

Research Project

Project/Area Number 15K13560
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Solid earth and planetary physics
Research InstitutionThe University of Tokyo

Principal Investigator

Takei Yasuko  東京大学, 地震研究所, 教授 (30323653)

Research Collaborator SASAKI Yuto  東京大学, 地震研究所, 大学院生
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords転位 / 非弾性 / 地震波減衰 / アナログ実験 / 多結晶体
Outline of Final Research Achievements

Rock anelasticity causes seismic dispersion and attenuation and hence plays an important role in the interpretation of seismological structures. Effects of dislocations on the rock anelasticity, however, have been poorly understood. We experimentally investigated the dislocation-induced anelasticity near room temperature by using borneol (organic polycrystal) as a rock analogue. We found that (1) deformation mechanism of borneol changes from diffusion to dislocation creep at the differential stress of about 1 MPa, (2) after the dislocation creep, Young's modulus was significantly reduced, (3) characteristic frequency of the dislocation-induced anelastic relaxation exists between 1 MHz and 100 Hz, and (4) the modulus recovered due to a dislocation recovery during the anelasticity measurement. (5) We further developed a new experimental system to measure anelasticity during the dislocation creep.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (3 results)

All 2018 2017 2016

All Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] Effects of dislocations on polycrestal anelasticity2018

    • Author(s)
      Y. Sasaki, Y. Takei, C. McCarthy, A. Suzuki
    • Organizer
      AGU fall meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of dislocation on rock anelasticity: Analogue experiment using organic polycrystals2017

    • Author(s)
      佐々木勇人、武井康子、クリスティーンマッカーシー、鈴木彩子
    • Organizer
      JpGU-AGU joint meeting
    • Place of Presentation
      幕張メッセ(千葉県、千葉市)
    • Year and Date
      2017-05-20
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 転位が岩石非弾性に与える影響:アナログ物質を用いた実験的研究2016

    • Author(s)
      佐々木勇人、武井康子、クリスティーン・マッカーシー、鈴木彩子
    • Organizer
      日本地球惑星科学連合、連合大会
    • Place of Presentation
      幕張メッセ(千葉県、千葉市)
    • Year and Date
      2016-05-22
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2019-03-29  

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