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タイトル: 1. Soft Core Spectrum Splitting of the Torsional Oscillation of an Elastic Sphere and Related Problems.
その他のタイトル: 1. 軟い核の存在による弾性球の捩れ振動スペクトルの分裂とこれに関連した問題
著者: SATO, Yasuo
著者(別言語): 佐藤, 泰夫
発行日: 1964年5月30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42冊第1号, 1964.5.30, pp. 1-10
抄録: The torsional oscillation of an earth model consisting of a homogeneous mantle and a soft homogeneous core is studied and the following matters are discussed and proved. (1) When there is a soft core those modes are predominant which have nearly equal frequencies to that of a liquid core model. (2) These modes are very high radial higher modes, and a simple formula that gives the order number of them is presented. (3) Consecutive spectrum lines far stronger than the other ones sometimes have nearly equal amplitudes and frequencies, which fact proves to be a kind of spectrum splitting phenomenon. (4) Depending on the density and rigidity ratios of the core and mantle observable frequency is higher or lower than that of a liquid core model, and there is also a possibility of two spectrum peaks having nearly equal amplitudes. This phenomenon will be of use for the determination of the core rigidity by means of the observation of free oscillation periods.
URI: http://hdl.handle.net/2261/12142
ISSN: 00408972


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