三原山の火山活動に関連する火口内の噴気孔温度の変動

概要

論文の詳細を見る
The temperature inside the fissures of the lave at the scores of the permanent observation points in the summit crater of Miharayama have been measured at the definite interval of time by the staff of the Oshima Weather Station with a thermocouple or a mercury-in-glass thermometer since the beginning of August, 1952. The writers have analysed the data of the measurements made during the period from 1952 to 1957, and have attempted to study the relation between the changes in the temperature of the grounds in the crater and the surface volcanic activities and the volcanic earthquakes and tremors that occurred during the announced period. With regard to the changes in the temperatures of the fumaroles at the observation points, 5 different types are notified, as designated by A, B, B', C, D. Of these, B-type change is of great significance from the volcanological viewpoint. The points, where such temperature change was observed, are located in the zone running through the pits active during these years and in the marginal zone of the circular central sink, nearly coinciding with the former central pit in the summit crater. Particular changes in temperature as referred to above may certainly be caused by increase in the underground activity or shallow intrusion of magma. Therefore, systematic temperature measurements of the ground may be useful in the prediction of the eruptive activities of the volcano.
1959-02-20