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タイトル: The 1950-1951 Eruption of Oo-sima and Its Seismometrical Investigations. (I)
その他のタイトル: 最近の大島の噴火とその地震計測學的研究(I)
著者: 水上, 武
宮崎, 務
高橋, 智子
著者(別言語): MINAKAMI, Takeshi
発行日: 1951年8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29冊第2号, 1951.8.30, pp. 359-381
抄録: 1. This report deals with the nature of the volcanic tremors accompanying the 1950 eruption of Oo-sima, with a brief description of its development included. The present research of the tremor is based on observations made by means of the displacement and acceleration seismographs. 2. On the basis of the relation between the amplitude of the tremor and the distance from its origin, it was made clear that these tremors propagated two dimensionally along the earth's surface from the active crater to each station. 3. From the assumption that the attenuation of amplitude is entirely caused by the viscosity of the mountain-formation, its coefficients are estimated to the range from 1.0×10° to 1.6×10° C.G.S. for the upper part of the formation and from 2.2 to 2.7×10° C.G.S. for the deeper part. 4. In order to make clear whether the tremors have the character of the Rayleigh type or the Love type, the problem was investigated with respect to the orbit of vibration. But the research failed to arrive at a final conclusion for the reason that the mode of vibrations was remarkably complex. 5. The acceleration of tremor observed directly by the acceleration-seismograph was compared with that calculated from the seismograms recorded by the displacement-seismograph. 6. The seismometric investigations of Oo-sima are still under way and this report deals only with vibrations of continuous train accompanying the Strombolian eruption. The research concerning the earthquakes of the ordinary type which occurred in the course of the present activity, will be reported in the forthcoming Bulletin. In conclusion, the writers wish to express their sincere thanks to Mr. S. Hiraga for the valuable assistance be afforded them in the seismometric observations at Oo-sima.
URI: http://hdl.handle.net/2261/11681
ISSN: 00408972


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