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  • On the Pulsatory Oscillations in Tokyo

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The pulsatory oscillations were observed at the seismologica observatory at Hommaru, Tokyo from Dec. 1st. 1925 to Jan. 21st. 1926. The Galitzin seismograph with photographic registration was used for the purpose. The pulsations observed at Tokyo may be classified into three sorts according to their periods: (A) those with a period shorter than 3 sec. (B) regular type with a period of 4-8 sec. and (C) irregular type with a period of more than 30 sec.

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