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タイトル: 丸の内に於て觀測された地上及地下の地震動に就て
その他のタイトル: On the Upper Surface and Underground Seismic Disturbances at the Down Town in Tokyo
著者: 齊田, 時太郎
鈴木, 正治
著者(別言語): Saita, Tokitaro
Suzuki, Masazi
発行日: 1934年9月30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12冊第3号, 1934.9.30, pp.517-526
抄録: Lately the authors have observed seismic disturbances at Marunouchi where is the representative ground of the down town in Tokyo. These observations were held at the same time in three places; which are surface ground, 30 feet and 68 feet deep underground respectively. The 68 feet deep underground level is exactly the boundary of alluvium and diluvium. The diluvium is made of compact materials and its bearing power is greater than 20 tons per square foot, while the alluvium is made of soft materials and its bearing power is less than 1 tons per square foot. Therefore, these observations have determine how 68 feet thick soft alluvial layer vibrates by seismic disturbances. The instruments were Ishimoto's seismic accelerometers. The authors have found that, in alluvial layer, there are numerous waves having about 0.2 sec. and 0.7 sec. periods; in diluvial formation, 0.25 sec. and 0.45 sec. respectively. In consequence of drawing the resonance curve for vibrations in the alluvium, the author are able to ascertain that 0.25 sec and 0.75 sec. are the proper periods of the alluvial layer. More-over, the acceleration in 68 feet deep underground was about 1/3 to 1/5 of the surface ground. These data will be available to engineering seismology and prevention for earthquake disaster.
URI: http://hdl.handle.net/2261/10143
ISSN: 00408972
出現カテゴリ:東京大学地震研究所彙報
東京大学地震研究所彙報

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