The authors designed a simple seismic instrument which counts the number of small earthquakes, automatically. The seismo-counter consists of a short-period pick-up, amplifiers, squaring circuits and a series of flip-flop circuits, and drives an electro-magnetic counter only when it receives a seismic signal exceeding both the pre-set level of amplitude and the pre-set pulse rate. In this way, it counts the number of seismic events accurately being unaffected by simple pulse signals as often origined from artificial noise sources. The authors reconstructed <three four>sets of the seismo-counters and operated them successfully to register the daily frequency of earthquake occurrence at several localities in and around the Matsushiro seismic area.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
46
号
3
ページ
697 - 705
発行年
1968-07-25
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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32.地震回数計 : その試作と観測結果
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