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タイトル: Self-potential Measurements on Shinmoe-Dake, Kirishima Volcanic Group
その他のタイトル: 霧島火山群・新燃岳の自然電位測定
著者: HASHIMOTO, Takeshi
KAGIYAMA, Tsuneomi
著者(別言語): 橋本, 武志
鍵山, 恒臣
増谷, 文雄
発行日: 1995年3月31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69冊第4号, 1995.3.31, pp. 257-266
抄録: We conducted self-potential(SP) surveys on Shinmoe-Dake, one of the active volcanoes in Kirishima volcanic group. The surveys cover an area of 1km × 1km including the crater. One of the prominent features is a negative anomaly on the crater basin. The streaming potential caused by drainage of water from the crater basin is a promising candidate for a cause of the negative anomaly. We quantitatively verified the plausibility of the mechanism using seepage of the lake water and the permeability of the ground, which were estimated from the water balance of the crater lake. Another prominent feature is positive SP anomalies on the eastern and southern slopes of Shiiimoe-Dake. These positive anomalies lie over relatively low resistive regions revealed by a magnetotelluric survey. This fact suggests that the present positive anomalies are generated by the streaming potential accompanied by hydrothermal upflows, although there still remains uncertainty because we have no information on the ground temperature. We also found positive patches of SP which were located at the fumaroles in the crater basin. However, they turned out to be rather small both in size and intensity after correcting for topographic effects. This suggests that hydrothermal activity just under the crater of Shinmoe-Dake is weak at present.
URI: http://hdl.handle.net/2261/13134
ISSN: 00408972


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