权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Ocean Bottom Electromagnetic Measurement System and Three-dimensional Structure of the Transition Zone between the Ocan and the Continent

海底电磁测量系统研制及海洋与大陆过渡带三维结构

基本信息

批准号：
62840009
负责人：
HAMANO Yozo
金额：
$ 11.65万
依托单位：
Earthquake Research Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

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.

本研究的目的是研制一种测量地球磁场三个分量和电场两个水平分量变化的海底系统。研究日本列岛及其邻近地区复杂的电磁结构需要这样一个系统。在1987年和1988年的研究期间，完成了名为Obem（海底电磁场测量装置）的系统，并在气象厅的Kakioka地磁观测站和东京大学的八岳地磁观测站进行了测试。1988年6月至11月，在胡安·德富卡海脊最南端进行了首次海底测量。该项目是国际合作研究（EMRIDGE项目）的一部分，旨在通过对洋脊系统下电磁结构的详细研究来探讨大洋板块的生成过程。本装置适用于研究，因为一台仪器可以测量现场的一整套电磁信号。包括本装置在内的海底仪器是由东京大学海洋研究所的hakuho-maru安装的，并由加拿大研究船Parizeau安全回收。