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タイトル: 14. 櫻島噴火に伴ふ短週期火山微動
その他のタイトル: 14. Volcanic Tremors of Short Periods at the Eruption of Sakura-jima
著者: 永田, 武
淺田, 敏
鈴木, 次郎
著者(別言語): Nagata, Takesi
Asada, Tosi
Suzuki, Ziro
発行日: 1948年6月30日
出版者: 東京大学地震研究所
掲載誌情報: 東京大學地震研究所彙報. 第24冊第1/4号, 1948.6.30, pp.185-192
抄録: Durling the eruption of Sakura-jima, we observed volcanic tremors of short periods by means of electromagnetic transducers. The magnification of instruments is about 110,000 times for the vibration of 20 cycles. The results of observation are as follows. (i) The frequency of waves is about 20 cycles and kept constant during the observation. This predominant period seems to be independent upon locality, as far as a few places we are concerned. (ii) The velocity is determined by two methods. The one is the determination of time lag between the arrival of wave group and sound of detonation, and the other the determination of phase difference of waves recorded by two transducers which are set about 7 meters distant from each other in the direction to the crator. The results of two methods fairly coincide with each other, the value of velocity being about 300m/sec. (iii) The waves are dispersive. (iv) We observed also two kinds of waves having the frequency of 5 cycles and about 80 cycles. (v) The variation in amplitude of main waves is also observed. It will be concluded from these results that the main waves are a kind of surface waves generated at the crator by the shock of eruption.
URI: http://hdl.handle.net/2261/10640
ISSN: 00408972


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