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タイトル: 13. An Experimental Study on Mechanism of Implosion Earthquakes during the 1973 Successive Eruptive Activity of Asama Volcano
その他のタイトル: 13. 1973年浅間火山に発生した断続微噴火に伴うImplosion地震に関する実験について
著者: Imai, Hiroshi
著者(別言語): 今井, 博
発行日: 1983年10月22日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第58冊第2号, 1983.10.22, pp. 385-400
抄録: In the course of eruptive activity of Asama Volcano in 1973, successive eruptions occurred during the period 16 to 18 February. Implosion earthquakes associated with the eruptive activity were examined by the present author, who presented a model for mechanism of the successive eruptions. A liquid film of magma in the model plays an important role in a discussion on energetics of dynamical process inside a volcanic conduit to interpret earthquake magnitudes of the implosion earthquakes. However, there is little information available for the film thickness of viscous liquid in the model. From this point of view, one of the most basic experiments was carried out to learn this information and to examine the validity of the model. In the present experiment, several kinds of silicon oils, whose viscosities are 50, 100, 300, 500 and 1000cs, were used on the basis of a parameter Nf which supports the application of the experimental results to the volcanological model. The film thickness was assumed to be one tenth of inner diameter of a volcanic conduit in the model. In the experimental results, the ratio of the film thickness of viscous liquid to the inner radius of pipe was found to range from 0.2 to 0.35 (or 0.1 to 0.18 to the inner diameter). Therefore, the model would be further confirmed from the present experiment. Moreover, a few basic data relative to bubble rising in viscous liquids are also discussed.
URI: http://hdl.handle.net/2261/12878
ISSN: 00408972


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