阿蘇火山1958年6月"大爆発"概報 : 抄

概要

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An explosion occurred suddenly at Nakadake crater of Aso volcano at 22h 15m, June 24, 1958. The blow and ejecta gushed southwestwards and broke down many houses situated at about 1000m from the crater. The initial velocity of the ejecta is estimated to be 100m/s and their amount about 380,000ton. The explosive energy is therefore about 10^<19> erg. Most of the ejected materials are fragments of various size derived from the crater filling tuff and lava blocks. Rarely lava fragments, origin of which may be essential or accessory, are found. The ejecta was hot enough so that the temperature measured was over 50℃ even in the ash at the place 1000m from the crater. The mechanical composition revealed by histogram and cumulative curve designates that the ejected material is of an intermediate character between ash fall and pumice flow.
特定非営利活動法人日本火山学会の論文
1959-02-20