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1995 Fiscal Year Final Research Report Summary

3D conductive structures and crustal activities beneath Japan islands

Research Project

Project/Area Number 05302022
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

SUMITOMO Norihiko  Disaster Prevention Research Institute, Kyoto University, Professor, 防災研究所, 教授 (50026788)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Tetsuya  Geomagnetic Observatory, Chief Researcher, 研究官
UCHIDA Toshihiro  Geological Survey, Chief Researcher, 地質調査所, 研究官
MISHINA Masaaki  Faculty of Science, Tohoku University, Associate Professor, 理学部, 助教授 (70004421)
SETO Masahiro  Faculty of Communication, Tohoku Institute of Technology, Professor, 通信学部, 教授 (60085412)
NISHIDA Yasunori  Faculty of Science, Hokkaido University, Professor, 理学部, 教授 (60000874)
Project Period (FY) 1993 – 1995
KeywordsMagnetotelluric / Microseismicity / Resistivity / Fault / ULF-MT / ELF-MT
Research Abstract

In 1993, magnetotelluric surveys in the frequency range from VLF to ULF were carried out in the northern part of Miyagi prefecture, north-east Japan. The result showed that microseismicity is clearly active in the zone just above an electrically low resistive block located at the depth of about 10km.
In 1994, similar MT surveys were carried out around Kakuto caldera situated in the southern part of Kyushu district, Japan. It was concluded that Ebino earthquake swarms likely occurred within the electrically resistive zone.
In 1995, we examined the electrical resistivity structure beneath Nojima fault which was recognized to be moved at the same time when Hyougoken-Nanbu earthquake occurred in January, 1995. This investigation is aimed to monitor the recovery process of the fault for a long time.
In addition to these investigations, Network-MT measurements utilizing the telephone company cables were conducted in a number of districts in Japan to obtain the basic structure of electric resistivity until the bottom of the earth crust.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 三品正明: "ネットワークMTデータに含まれる電車漏洩電流ノイズの振幅変化について" CA研究会論文集. 59-60 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村上英記: "ネットワークMT法データの圧縮法について" CA研究会論文集. 163-166 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山本哲也: "リモートリファレンスの利用とその限界" CA研究会論文集. 174-183 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田中良和: "雲仙山頂部における地磁気3成分観測" CA研究会論文集.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mishina, M: "Amplitude variation of leakage current noises from electric railways which are included in the Network-MT data." Proc.of Conductivity Anomaly Symposium. 59-64 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Murakami, H: "A compression method of Network-MT-data." Proc.of Conductivity Anomaly Symposium. 163-166 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamomoto, T: "Use of remote reference method and its limit." Proc.of Conductivity Anomaly Symposium. 174-183 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanaka, Y: "Geomagnetic three components observation on the summit of Unzen Volcano." Proc.of Conductivity Anomaly Symposium. 121-126 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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