A rubidium vapour magnetometer was operated at the top of Mt. Minakamiyama during the period from November 1966 to February 1967. Time variations in the field gradient over 100m were observed. In order to eliminate the electric railway noises, magnetic variations were averaged during the period from one hour before to one hour after the earthquakes. Although random noises were reduced to the level less than 0.03γ, no marked variations that might be associated with earthquake occurrences were recognized. Extremely local variations were noted in the field difference between the points of 100m distance at the time of externally applied magnetic disturbances such as bays, diurnal variations and magnetic storms.
Varrian社のルビディウム磁力計を皆神山頂上に設置し, 1966年11月より1967年4月まで2点間の全磁力差を連続的に観測した.地震前後に比較的短時間の微小な地磁気変化が起るかどうかを調べるのが目的である.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
45
号
3
ページ
919 - 944
発行年
1967-11-30
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
453
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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Geomagnetic and Geoelectric Studies of the Matsushiro Earthquake Swarm (6)
ji0453018.pdf
(1.2MB)
