著者

寺田 寅彦

出版者

東京帝国大学地震研究所

雑誌

東京帝国大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.13, no.4, pp.801-805, 1935-12-20

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Two cases of minor eruption of Mt. Asama are described. . A sample of ash collected on the occasion of the eruption on Aug. 4, 1935, consists of compact nuclei of rock fragment, a few tenth of mm in diameter, which is covered with a spongy mantle of aggregated fine ash particles. Possible causes of the origin of such a structure are suggested. As for the eruption of Aug. 17, 1935, an abnormal distribution of the intensity of audible sound within a narrow range of 10 km from the crater is described.