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A study of the survey method for 3D cavities using the high-frequency CSMT system in the transient frequency region

Research Project

Project/Area Number 16560711
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Earth system and resources enginnering
Research InstitutionSaga University

Principal Investigator

HANDA Shun  Saga University, Agriculture, Professor, 農学部, 教授 (70156529)

Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2006: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
KeywordsHigh frequency CSMT / underground cavities / 3D finite difference method / near-field / 有限差分法 / 地下壕探査 / 3次元有限差分法
Research Abstract

Underground cavities are one of the difficult targets to detect their positions by the electromagnetic surveys. Many unstable tunnels, of which locations are not clear, are buried in Shirasu layers in Kagosima Prefecture. In our survey using the HFCSMT system, it is found that apparent resistivities for tunnels, which are observed in the source-receiver distance of the transient frequency regions, are intensely amplified, relatively to those observed by the MT survey.
In order to confirm this, electromagnetic responses of the tunnel-shaped underground cavities buried at four depths are calculated using the three-dimensional finite difference method (3DFDM). The results of calculation are:
1 the amplification rates of apparent resistivity caused by the tunnels in the transient region are larger than those in the far-field region,
2 these values are hardly controlled by frequency and the resistivity of the Earth and are roughly proportion to an exponential of the tunnel's depth,
3 this amplifications is not caused by the vertical loop antenna but by the horizontal loop antenna by which the increase of resistivity is occurred in the transient region.
These results indicate that the amplification of apparent resistivity is advantageous to detect underground cavities in the survey.

Report

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

    (8 results)

All 2006 2005

All Journal Article (8 results)

  • [Journal Article] 3次元地下空洞のニアフィールド遷移域での電磁応答2006

    • Author(s)
      半田 駿
    • Journal Title

      物理探査学会学術講演会講演論文集 115

    • NAID

      10018357223

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Electromagnetic responses of 3D cavities in the transient region2006

    • Author(s)
      Shun Handa et al.
    • Journal Title

      Proc. of Japan Geoexpl. Soc. 115

    • NAID

      10018357223

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 3次元地下空洞のニアフィールド遷移域での電磁応答2006

    • Author(s)
      半田 駿
    • Journal Title

      物理探査学会第115回講演会論文集

    • NAID

      10018357223

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 高周波CSMT装置を用いたニアフィールド領域での地下壕探査2005

    • Author(s)
      板井 秀典
    • Journal Title

      物理探査 58

      Pages: 147-155

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 物理探査手法によるシラス地盤に現存する特殊地下壕探査の実証実験2005

    • Author(s)
      北村 良介
    • Journal Title

      物理探査学会学術講演会講演論文集 112

      Pages: 161-164

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] An proof experiment of an air-raid shelter by plural geophysical investigations2005

    • Author(s)
      Ryosuke Kitamura et al.
    • Journal Title

      Proc. of Japan Geoexpl. Soc. 112

      Pages: 161-164

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Surveys for underground cavities with the HFVSMT system in near-field regions2005

    • Author(s)
      Hidenori Itai et al.
    • Journal Title

      Buturitansa 58

      Pages: 147-158

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 高周波CSMT装置を用いたニアフィールド領域での地下壕探査2005

    • Author(s)
      板井秀典
    • Journal Title

      物理探査 58・2

      Pages: 1-10

    • Related Report
      2004 Annual Research Report

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

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