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タイトル: A Brief Note on the Eruption of the Yake-dake Volcano of June 17, 1962
その他のタイトル: 1962年6月17日の焼岳火山の噴火について
著者: Murai, Isamu
著者(別言語): 村井, 勇
発行日: 1963年3月10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40冊第4号, 1963.3.10, pp. 805-814
抄録: The eruption occurred suddenly at about 9:55 p.m. on June 17, 1962 at the Yake-dake Volcano. The outbursts did not occurr at the summit crater, but took place at the Kurodani Crater and the Nakaotoge Explosion Crater. New fissures were opened on the wall of the explosion crater. The entirety of ejected debris does not belong to the juvenile materials. They were brought from the pre-existing rocks on the upper part of the volcano. Discharge of ash and debris ceased on the evening of June 18. The total volume of ejected materials is calcu- lated as 2×105m3, and the total mass of them is 3×105 ton for the density of ash-fall deposits in a compact packing state is about 1.6. From the morning of June 18, minor mudflows occurred on the western steep slope of the summit. On the afternoon of June 19, other mudflows occurred from the edge of the fissure at the Nakao-toge, being accom- panied with intense noises and air shocks. These mudflows might have been caused by the flowage of over-saturated ash and debris piled on the steep slopes around the summit, where tremendous amount of water vapour contained in the eruption clouds condensed on the ground and wetted newly piled ash and debris. After the eruptions on June 17 and 18, some minor outbursts took place sporadically, i. e. on July 26 and on August 9, 1962.
URI: http://hdl.handle.net/2261/12083
ISSN: 00408972


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