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タイトル: The Anomalous Behaviour of Geomagnetic Variations of Short Period in Japan and Its Relation to the Subterranean Structure. THe 10th report.
その他のタイトル: 日本における地磁気短周期変化の異常と地下構造(第10報)
著者: Rikitake, Tsuneji
Yabu, Takeo
Yamakawa, Kazumi
著者(別言語): 力武, 常次
藪, 武夫
山川, 和美
発行日: 1963年3月10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40冊第4号, 1963.3.10, pp. 693-717
抄録: An s.f.e. that occurred on Aug. 16, 1958 is analysed in the hope of studying the underground structure beneath Japan. Since the inducing field prevails in a westerly direction in this case, it is expected to add something new to the previous studies because the analyses hitherto made have been mostly concerned with changes in a north-south direction. The distributions of magnetic potential for the s.f.e., both external and internal origins, are obtained first. On the basis of the distributions of magnetic potential and vertical component in and around Japan it is concluded that the anomalous part of the induced field, that is not quite vanishing even for the present case, seems likely to be caused by the northerly change in the inducing field though it is much smaller than the westerly one. As far as we assume that the anomaly of geomagnetic variations of short period in Japan is caused by electric currents flowing in an underground circuit connected to the conducting part of the mantle, as has been discussed in the previous papers, the connecting points must be located on a line running approximately from east to west, so that very little current is excited in the circuit when the inducing field changes to an east-west direction. The world's maps of magnetic potential enable us to discuss the earth's electrical state on a large scale. Applying a theory of electromagnetic induction by a time-dependent magnetic dipole in a spherical conductor, a conclusion which differs very little from the previous one for the average state of the earth'is^obtained.
URI: http://hdl.handle.net/2261/12077
ISSN: 00408972


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