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タイトル: 13. 最近の櫻島火山の活動に就いて(Ⅱ) : 新熔岩流の帶磁と傾斜變化
その他のタイトル: 13. Recent Activity of Volcano Sakura-zima, (Ⅱ)
著者: 水上, 武
佐久間, 修三
著者(別言語): Minakami, Takeshi
Sakuma, Shuzo
発行日: 1948年6月30日
出版者: 東京大学地震研究所
掲載誌情報: 東京大學地震研究所彙報. 第24冊第1/4号, 1948.6.30, pp.179-184
抄録: A survey of geomagnetic dip was repeated by the dip circle used in the first survey in 1939. Remarkable changes in dip were not observed at any place in the Sakura-zima Island but one situated quite near the new lavaflow. By another dip-survey across the north side of the newlava, it was found that the lava was magnetized in the direction of the present geomagnetic field as a whole, and its intensity of magnetization calculated from the observed anomaly was 0.005±0.001 e.m.u. Measurement of tilt of the ground was also repeated in the same manner as in April. Most of bench-marks having bean destroyed, during Apr.~Oct., only three groups of them remained. At these stations, the ground tilted towards the same direction as before(See Fig.4), and its daily rate of the tilt decreased to 1/9 of that of April. The topographic distribution of direction of tilt suggests that the island consists of more than three blocks. A topographic survey near the new crater was carried out by a mountain barometer and a clinometer.
URI: http://hdl.handle.net/2261/10639
ISSN: 00408972


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