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Logn-term, Absolute Measurement of the 3 Componets of Geomagnetic Field and Establishment of Fixed Geomagnetic Stations at the Sea Floor

Research Project

Project/Area Number 60840006
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionThe Univerisity of Tokyo

Principal Investigator

SEGAWA Jiro  Professor, Ocean Research Institute, University of Tokyo, 海洋研究所, 教授 (60013570)

Co-Investigator(Kenkyū-buntansha) UTADA Hisashi  Research Associate, Earthquake Reserarch Institute, Univ. of Tokyo, 地震研究所, 助手 (70134632)
HAMANO Yozo  Accosiate Professor, Earthquake Research Institute, Univ. of Tokyo, 地震研究所, 助教授 (90011709)
YUKUTAKE Takesi  Professor, Earhtquake Research Institute, Univ. of Tokyo, 地震研究所, 教授 (90012898)
@FURUTA Toshio  Technical Staff, Ocean Research Institute, Univ. of Tokyo, 海洋研究所, 教務職員 (30107461)
KOIZUMI Kin-ichiro  Technical Stadd,Ocean Resarch Institute, Univ. of Tokyo, 海洋研究所, 教務職員 (70107457)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥29,000,000 (Direct Cost: ¥29,000,000)
Fiscal Year 1987: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1986: ¥11,000,000 (Direct Cost: ¥11,000,000)
Fiscal Year 1985: ¥13,000,000 (Direct Cost: ¥13,000,000)
KeywordsSea flooe mabnetic field / 3-component magnetometer / proton magnetometer / Sea floor observation station / Submersible / Sea floor electric field recorder / 海底電位差計 / フラックスゲート型磁力計 / 海底観測 / 磁場絶対測定 / 地磁気3成分 / 海底地磁気定点 / 3成分海底磁力計 / オーバーハウザー
Research Abstract

Main results we have obtained through this study can be summatized as follows: (1) A small 3-component fluxgate magnetometer(OBM-S5) was developed. As this meter is deiven by a battery installed separately from the sensor housing is is not affected by the magnetization battery and can continue measurement for a longer time.
(2) Another Fluxgate magnetometer (OBM-C3) whose sensor was installed about I m above the electronics was developed in order to remove the magnetic effect from the electronics components completely. (3) A proton magnetometer for sea floor use (OBP) was developed to be used for calibration of the fluxgate magnetometer. (4) An electric field recorde for the sea floor (OBE) was developed.
Using the equipments mentiones above a dea floor experiment was conductod in the area of the Izu-Bonin ridge alon the parallel 33゜N from August to October 1986 (about 75 days). In the next year from July to October (78 days) another sea floor experiment was conducted in the area a little south of the last area along the parallel 31゜N Through these experiments is was proven that thr fluxgate magnetometer could be calibrated with the aid of a proton marnetometer installed nearby. This result will ensure the plausibility of making absolute measurements of 3-component magnetic field at the seq floor. Another importani result of our study is the installation of thw Ocean Bottom Observation Station in the Sagami Bay from October to November 1987. This station made of non-magnetic concrete, equipped with an acoustic transponder, works as a permanent oceam bottom platrofm reaccessible at any timw. In November the Oceam Bottom Platform was visited by a manned submersible of the Japan Matine Scienece and Technoloby Center and it was confirmed that the platform setteld in a good condition.

Report

(3 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • 1985 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] SEGAWA,Jiro: Journal of Geodetic Society of Japan. 32. 248-273 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 瀬川 爾朗: 日本測地学会第66回講演会要旨. (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小泉金一郎: 昭和63年春期日本地球電磁気地球惑星圏学会講演. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] SEGAWA, Jiro: "Measutement of geomagnetic field by Ocean Bottom Proton Magnetometer (I)." Read at 66th Assembly of the Geodetic Society of Japan 1986 at Mizusawa. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] SEGAWA, Jiro: "A sea floor magnetometer Model OBM-S4" Journal of Geodetic Society of Japan. 32. 248-273 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] KOIZUMI, Kin-ichiro: "Measutement of geomagnetic filed by an Ocean Bottom Magnetometer and comparison with the measurement of a Fluxgate magnetometer." To be read at the spring assembly of the Geomagnetism and Terrestrial;Planetary Sciences 1988 at Koganei City.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 日本地球電気磁気学会誌. (1986)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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