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タイトル: 地震波によりて誘起せられたる土地の固有振動に就いて
その他のタイトル: On the Earth-vibrations Induced in Some Localities at the Arrival of Seismic Waves
著者: 今村, 明恒
著者(別言語): Imamura, Akitune
発行日: 1930年4月8日
出版者: 東京帝国大学地震研究所
掲載誌情報: 東京帝国大学地震研究所彙報. 第7冊第3号, 1930.4.8, pp.489-494
抄録: Seismograms may involve, besides seismic waves propagated from the focus to our stations, earth-vibrations induced there by means of the seismic waves thus arrived. The present note contains some analytical study concerning such earth-vibrations. Fig. 1 shows seismograms due to the earthquake, which occurred on Nov. 6,1925, near Kasumigaura and was registered at diluvial ground in Tokyo, B and D with an Imamura tromometer (V=50, T0=7 sec.) installed at the ground level upon a concrete block of 3×3×1 ft. size, and A and C with another similar instrument set up on a rigid pedestal of 16.1×11.6×4.3 ft. size. The pedestal is situated about 210 m. apart from the first station, with its upper level lower than the ground-level by 4.9 m. The difference of the earth-movements indicated by the seismograms obtained at these two stations reveals that there were induced in the thin surface layer of the place small earth-vibrations of a period ranging from 0.2 to 0.4 sec.
URI: http://hdl.handle.net/2261/9949
ISSN: 00408972


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