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タイトル: 伊豆大島湯場地域における地熱調査
その他のタイトル: A Geothermal Survey at Yuba in Ooshima Island, Izu.
著者: 上田, 誠也
著者(別言語): Uyeda, Seiya
発行日: 1957年1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34冊第4号, 1957.1.30, pp. 365-371
抄録: A brief survey of underground temperature at Yuba in Ooshima Island was made (Fig. 1). Yuba is known for a natural steam-bath and is located on the outer slope of the somma of the Volcano Mihara. The temperature measurement was conducted by thermistors. 14 hard vinyl-tubes with a length of 1-2m were buried vertically around the steam-bath as seen in Fig. 2 and the thermistors were inserted into them. The results are listed in Table I and Fig. 4, in which it is noticed that the temperature rises with depth actually in some holes near the steam-bath. Based upon these data, temperature profiles for the vertical sections passing through the holes 10, 9, 6, 2, 12 and 4, 14, 7, 5, 2, 3, 13 (Fig. 5a, b) and an isothermal contour map at a depth of 1m (Fig. 6) were tentatively plotted. An underground hot body separated from the steam-bath itself can be clearly observed from these figures. By using the observed temperature gradient at a depth between 1 m and 2m and by assuming the thermal conductivity of the soil as 0.001 cal/cm. sec. deg., the approximate amount of heat flow was estimated to be of the order of 10-5cal/sec. cm2 near the hot bodies. (The amount of the heat flowing-in due to the meteorological factors was eliminated empirically.)
URI: http://hdl.handle.net/2261/11868
ISSN: 00408972


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