| Project/Area Number |
62840009
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
固体地球物理学
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| Research Institution | Earthquake Research Institute |
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Principal Investigator |
HAMANO Yozo Earthg. Res. Inst., Univ. of Tokyo, Assoc. Prof., 地震研究所, 助教授 (90011709)
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| Co-Investigator(Kenkyū-buntansha) |
SEGAWA Jiro Ocean Res. Inst., Univ. of Tokyo, Prof., 海洋研究所, 教授 (60013570)
YUKUTAKE Takesi Earthg. Res. Inst., Univ. of Tokyo, Prof., 地震研究所, 教授 (90012898)
UTADA Hisashi Earthg. Res. Inst., Univ. of Tokyo, Research Assoc., 地震研究所, 助手 (70134632)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥18,200,000)
Fiscal Year 1988: ¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 1987: ¥9,000,000 (Direct Cost: ¥9,000,000)
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| Keywords | Sea Floor Measurements / Ocean Bottom Magnetometer / Ocean Bottom Electric Field Apparatus / Three-dimensional Structure / Juan de Fuca Ridge / 3次元構造 |
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| Research Abstract |
Purpose of the present investigation is to develope an ocean bottom system which measures the variations of the three components of the magnetic field and two horizontal components of the electric field of the earth. Such a system is required to study the complicated electromagnetic structures beneath the Japanese Islands and the adjacent area. During the studying period of 1987 and 1988, the system named Obem (Ocean Bottom Electric and Magnetic field measurement apparatus) has been completed, and tested at Kakioka Magnetic Observatory of the Meteololgical Agency and Yatsugatake Magnetic Observatory of the University of Tokyo. Druing the development of the apparatus, magnetic sensor, electrode, pressure vessel, measureing circuits, power source, and acoustic release system have been reexamined to fit to the present purpose.
The first sea floor measurement by using the presently developed Obem was made during june and November of 1988 at the southern-most part of the Juan de Fuca ridge. The project is a part of the international coopertive study (EMRIDGE project), which aimes to investigate the generating process of the oceanic plate from a detailed study of the electromagnetic structure beneath the ridge system. The present apparatus is suitable for the study, since one instrument can measure a complete set of the electromagnetic signals at the site. The sea floor apparatus including the present one was installed by hakuho-maru which belongs to the Ocean Research institute of the University of Tokyo, and were safely recovered by Canadian research vessel Parizeau.
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