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Development of 2-Dimensional ESR thermal imaging apparatus and its application to drill core samples collected from a subduction seismogenic zone

Research Project

Project/Area Number 16340156
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

FUKUCHI Tatsuro  Yamaguchi University, Graduate School of Science & Engineering, Associate Professor, 大学院理工学研究科, 助教授 (90212183)

Co-Investigator(Kenkyū-buntansha) MIKI Toshikatsu  Yamaguchi University, Graduate School of Science & Engineering, Professor, 大学院理工学研究科, 教授 (70091212)
CHIJIWA Kazutoyo  Yamaguchi University, Faculty of Education, Associate Professor, 教育学部, 助教授 (50217238)
SAKAGUCHI Arito  Japan Agency for Marine-Earth Science & Technology, Institute for Research on Earth Evolution, Scientist, 地球内部変動研究センター, 研究員 (80304666)
IMAI Noboru  Advanced Industrial Science & Technology, Institute of Geology & Geoinformation, Geochemical Group, Leader, 地球科学情報研究部門・地球化学研究グループ, グループ長 (20356512)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥7,200,000 (Direct Cost: ¥7,200,000)
Keywordselectron spin resonance / ferrimagnetic resonance / fault / frictional heating / pseudotachylyte / vitrinite reflectance / subduction zone / seismogenic zone / 沈み込み帯 / 地震発生域
Research Abstract

We have developed a 2-Dimensional electron spin resonance (ESR) imaging apparatus to nondestructively analyze heating events in fault rocks. The 2-D ESR imaging apparatus is composed of a slit cavity (slit width 3mmx10 mm), an external coil for 100kHz modulation field and an X-Y stage, in addition to an ordinary ESR spectrometer. To improve the resolution of 2-D ESR images, we remodeled the slit cavity and stuck a thin brass plate with a pinhole of Ф 2.6mm on the slit cavity. Consequently, the resolution is considerably improved from 2~3mm to 0.25mm. We have carried out 1-D continuous ESR measurement and 2-D ESR imaging of Nojima fault rocks using the 2-D ESR imaging apparatus. The target ESR signal for the 1-D and 2-D ESR measurements is a ferrimagnetic resonance (FMR) signal of iron oxides, which are generated and increased by heating. As a result, we have succeeded in detecting with precision of 0.25mm frictional heating events during ancient repeated earthquakes. The detection of f … More rictional heating events with such a high precision is the first in the world. Furthermore, we have studied a new method to estimate frictional heat temperature from 1-D ESR continuous data and developed an analytical computer program for it. In the next step, we plan to carry out 2-D ESR imaging of Taiwan Chelungpu Fault Drilling Project (TCDP) Hole B core samples and estimate frictional heat temperature in the 1999 ChiChi Earthquake, because this drilling project was delayed and consequently we could not measure 2-D ESR images of the core samples in the term of our scientific research project. On the other hand, we have considered how to convert a 2-D ESR image into a 2-D magnetic susceptibility map, and actually made 2-D magnetic susceptibility maps of natural rocks such as magnetite ore, serpentinite, gabbro, Nojima fault rocks and Chelungpu fault rocks by comparison with a standard Nickel sample (54.56 emu/g). In addition, we carried out basic studies on FMR signals of iron oxides and vitrinite reflectances of brown coal and mudstone, applied these indicators for frictional heating to Nojima fault and Chelungpu fault drill core samples, and estimated frictional heat temperatures in the 1995 Kobe and 1999 ChiChi Earthquakes, respectively. Less

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (9 results)

All 2007 2005 2004 Other

All Journal Article (6 results) Book (3 results)

  • [Journal Article] ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan.2007

    • Author(s)
      Tatsuro Fukuchi, Jun-ichiro Yurugi, Noboru Imai
    • Journal Title

      Tectonophysics,

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan2007

    • Author(s)
      Tatsuro Fukuchi
    • Journal Title

      Tectonophysics doi:10.1016/j.tecto.2007.01.020

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Ferrimagnetic resonance signal produced by frictional heating : A new indicator of paleoseismicity.2005

    • Author(s)
      Tatsuro Fukuchi
    • Journal Title

      Journal of Geophysical Research(電子版) Vol.110

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Ferrimagnetic resonance signal produced by frictional heating : A new indicator of paleoseismicity.2005

    • Author(s)
      Tatsuro Fukuchi, Kazuo Mizoguchi, Toshihiko Shimamoto
    • Journal Title

      Journal of Geophysical Research Vol.110, B 12404

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Ferrimagnetic resonance signal produced by frictional heating : A new indicator of paleoseismicity2005

    • Author(s)
      Fukuchi, T., Mizoguchi, K., Shimamoto, T.
    • Journal Title

      Journal of Geophysical Research(電子版) Vol.110

    • Related Report
      2005 Annual Research Report
  • [Journal Article] ESR detection of seismic frictional heating events in the Nojima fault drill core samples, Japan.

    • Author(s)
      Tatsuro Fukuchi
    • Journal Title

      Tectonophysics(電子版)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] ESR法による断層活動年代測定-その原理と実践-,深田研ライブラリーNo.632004

    • Author(s)
      福地 龍郎
    • Total Pages
      45
    • Publisher
      財団法人 深田地質研究所
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] ESR Dating of Fault movements-Its principle and practice, No.63(in Japanese)2004

    • Author(s)
      Tatsuro Fukuchi
    • Total Pages
      45
    • Publisher
      Fukadaken Library, Fukada Geological Institute, Tokyo
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] ESR法による断層活動年代測定-その原理と実践-2004

    • Author(s)
      福地 龍郎
    • Total Pages
      45
    • Publisher
      財団法人 深田地質研究所
    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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