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タイトル: Electrical Conductivity and Temperature in the Earth.
その他のタイトル: 地球内の電氣傳導度と温度
著者: 力武, 常次
著者(別言語): RIKITAKE, Tsuneji
発行日: 1952年4月25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30冊第1号, 1952.4.25, pp. 13-24
抄録: The theory of ionic crystals is applied to study the electrical conductivity in the earth's mantle in a manner improving that of the writer's previous study. The constants included are estimated as accurately as possible. The changes in physical conditions in up- and down-sides of the "20° discontinuity" is also taken into account. After taking into account the pressure-effect on the conductivity, it is found that the temperature likely amounts to 1000° K just below the earth's crust and then increases almost proportionally to depth, the rate of increase being estimated at 1.4°K per km. The distribution is roughly consistent with the distribution of density and bulk modulus in the earth's mantle which is determined by Bullen. The earth's internal temperature has been hitherto studied from standpoints quite different from the one considered here, such as from the studies in the cooling of the earth and the pressure-effect on melting point. In order to compare the present result with those obtained before, the distribution obtained by H. Jeffreys, E. C. Bullard and B. Gutenberg are shown in Fig. 6 together with the writers'. However, all these distribution are by no means conclusive. Much more experiments for various quantities, especially under high pressure and temperature, are necessary before a more concrete knowledge on the earth's internal temperature is to be obtained. The writer is grateful to Dr. T. Nagata for his helpful advice.
URI: http://hdl.handle.net/2261/11710
ISSN: 00408972


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