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ESR & OSL analyses of seismic frictional heating events recorded in fault gouge and their application to deep drill core samples

Research Project

Project/Area Number 13640462
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionYamaguchi University

Principal Investigator

FUKUCHI Tatsuro  Yamaguchi University, Faculty of Science, Associate Professor, 理学部, 助教授 (90212183)

Co-Investigator(Kenkyū-buntansha) ITO Yasuo  Tokyo University, Research Center for Nulear Science and Technology, Professor, 原子力研究総合センター, 教授 (40011150)
IMAI Noboru  National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Group Leader, 地球科学情報研究部門, 研究グループ長 (20356512)
KAMATA Yoshihito  Yamaguchi University, Faculty of Science, Research Associate, 理学部, 助手 (30294622)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
KeywordsFSR / OSL / fault / frictional heat / fault gouge / pseudotachylyte / ferrimagnetism / FMR / 活断層 / 強磁性共鳴
Research Abstract

We examine the Nojima pseudotachylyte found along the Nojima fault, which caused the 1995 Kobe Earthquake (M=7.2) in Japan, using the electron spin resonance technique. The Nojima pseudotachylyte has a strong FMR (ferrimagnetic resonance) signal derived from bulky trivalent iron ions in ferrimagnetic iron oxides (a^^~-Fe_2O_3: maghemite). This FMR signal appears by heating the surrounding fault gouge that is the source material of the Nojima pseudotachylyte. Furthermore, the magnetic susceptibilities of the Nojima pseudotachylyte are 10^2〜10^3 times larger than those of the surrounding fault gouge and are proportional to the FMR signal intensities. We reconstructed the magnetization process of fault gouge during ancient seismic fault slip using the FMR signal. As a result, the maximum instantaneous magnetization of the Nojima fault gouge may have reached about 10-20nT and may have further induced a maximum geoelectric potential change of about 120mV/km^2 by electromagnetic induction. F … More urthermore, we carried out high-speed shearing tests using the dry fault gouge. As a result, we have found that the frictional heat temperature in a dry fault gouge zone remains a high temperature such as 600℃ even though the frictional coefficient suddenly decreases due to thermal pressurization with the release of absorptive and interlayer waters by frictional heating. The dry fault gouge changes into a black ferrimagnetic material (a^^~-Fe_2O_3: maghemite) by high-speed shearing. The coercive force obtained from the black ferrimagnetic material after high-speed shearing is much smaller than that after heating in an electric furnace. This indicates that we can determine whether it is pulsated heating or long-term heating by estimating the magnitude of coercive force. On the other hand, we studied physical basis of optically stimulated luminescence (OSL) emitted from feldspars. The blue peak detected from feldspars in the Nojima fault gouge by UV-stimulations completely decays by heating at 600℃ and at the same time another broad yellow peak appears. This yellow peak also completely decays by heating until 870℃. These results indicate that these OSL peaks are applicable to the detection of seismic frictional heat. In case of feldspars in the Nojima pseudotachylyte, the blue and red peaks have been much more decreased. This suggests that the feldspars have been subjected to high temperature by ancient seismic frictional heating. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] T.Fukuchi, H.Mie, S.Okubo, N.Imai: "Assessment of fault activity by ESR dating of fault gouge using surface E' center in quartz produced with clay mineralization : The case of the Atotsugawa Fault in Japan"Advances in ESR Applications. Vol.18. 145-151 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Fukuchi, T.Nishimura: "Decay characteristics of vacancy-associated ESR centers in quartz by UV-irradiation : A physical basis for absolute dating of planetary sediments"Advances in ESR Applications. Vol.18. 171-176 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Fukuchi: "Strong ferrimagnetic resonance signal and magnetic susceptibility of the Nojima pseudotachylyte in Japan and their implication for coseismic electromagnetic changes"Journal of Geophysical Research. Vol.108(in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 福地龍郎, 溝口一生, 嶋本利彦, 林 愛明: "ESR解析による断層摩擦発熱温度の推定-野島断層と高速剪断実験結果を例として-"月刊地球. 号外No.36. 82-89 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 福地龍郎: "高エネルギー粒子線照射により生成される石英格子欠陥中心のESR研究"原研施設利用共同研究成果報告書(平成12年度). 通巻40号. 68-71 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fukuchi T., Mie H., Okubo S., Imai N.: "Assessment of fault activity by ESR dating of fault gouge using surface E' center in quartz produced with clay mineralization: The case of the Atotsugawa Fault in Japan"Advances in ESR Applications. vol.18. 145-151 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fukuchi T., Nishimura T.: "Decay characteristics of vacancy-associated ESR centers in quartz by UV-irradiation: A physical basis for absolute dating of planetary sediments."Advances in ESR Applications. vol.18. 171-176 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fukuchi T.: "Strong ferrimagnetic resonance signal and magnetic susceptibility of the Nojima pseudotachylyte in Japan and their implication for coseismic electromagnetic changes"Journal of Geophysical Research. Vol.108(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fukuchi T., Mizoguchi K., Shimamoto T., Lin, A.: "ESR analysis of frictional heat temperature by faulting- The cases of the Nojima fault and high-speed shearing"Chikyu Monthly, Special edition. No.36. 82-89 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Fukuchi T.: "ESR studies of lattice defect centers produced in quartz by high energy particles irradiation"Report of the Inter-University Program for the Joint Use of JAERI Facilities. Vol.40(UTRCN-G-30). 68-71 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Fukuchi, T.Nishimura: "Decay characteristics of vacancy-associated ESR centers in quartz by UV-irradiation : A physical basis for absolute dating of planetary sediments"Advances in ESR Applications. Vol.18. 171-176 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Fukuchi, H.Mie, S.Okubo, N.Imai: "Assessment of fault activity by ESR dating of fault gouge using surface E'center in quartz produced with clay mineralization : The case of the Atotsugawa Fault in Japan"Advances in ESR Applications. Vol.18. 145-151 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Fukuchi: "Strong FMR signal and magnetic susceptibility of the Nojima pseudotachylyte in Japan and their implication for coseismic electromagnetic changes"Journal of Geophysical Research. Vol.108(in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 福地龍郎, 溝口一生, 嶋本利彦, 林 愛明: "ESR解析による断層摩擦発熱温度の推定-野島断層と高速剪断実験結果を例として-"月刊地球. 号外No.36. 82-89 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 福地龍郎: "高エネルギー粒子線照射により生成される石英格子欠陥中心のESR研究"原研施設利用共同研究成果報告書(平成12年度). 通巻40号. 68-71 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Fukuchi, N.Imai: "ESR and ICP analyses of the DPRI 500m drill core samples penetrating through the Nojima fault, Japan."The Island Arc. Vol.10. 465-478 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 福地龍郎, 溝口一生, 嶋本利彦, 林愛明: "ESR解析による断層摩擦発熱温度の推定-野島断層と高速剪断実験結果を例として-"月刊地球『沈み込み帯地震発生帯の物質科学と深海掘削』. 号外36号. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Fukuchi, T.Nishimura: "Decay characteristics of vacancy-associated ESR centers in quartz by UV-irradiation : A physical basis for absolute dating of planetary sediments"Proceedings of the International Symposium on New Prospects of ESR Dosimetry and Dating. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Fukuchi, H.Mie, S.Okubo, N.Imai: "Assessment of fault activity by ESR dating of fault gouge using surface E' center in quartz produced with clay mineralization : The case of the Atotsugawa Fault in Japan"Proceedings of the International Symposium on New Prospects of ESR Dosimetry and Dating. (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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