掲載雑誌（和）： 日本地震工学シンポジウム講演集 Vol： 7巻 年： 1986年 頁： 235-240頁 著者（和）： - タイトル（和）： - 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM 著者（英）： Kensuke YAMAZAKI, Masashige MINAMISHIMA タイトル（英）： EXPERIMENTAL STUDY ON PROPAGATION CHARACTERISTICS OF EARTHQUAKE STRONG-MOTION IN SEDIMENTARY LAYERS 抄録（英）：
In order to make clear the effects of sedimentary layer on strong ground motion due to earthquakes, a tripartite array with strong-motion digital accelerographs of three orthogonal components has been deployed since 1982 in the campus of Tokyo Gakugei University, Koganei, Tokyo. Several events among all the data acquired by the present are available for analyses. Although the maximum height and the phase of high frequency acceleration are strongly affected by variety of surficial portion (thickness ■ 10m) underlying the foundation of seismographs, ground velocity and ground displacement of each station of the array show coherent signals with same amplitude but poorly discriminated phase lags each other up to the coda of the wave trains. However, filtrated waves of the raw data through some narrow pass bands exhibit clearly discriminated phase lags among the three stations throughout the wave trains right after S-wave onset. Method of sums and the Fourier analysis are adopted to derive apparent velocities of he later phases which are considerable amplitude in ground displacement and ground velocity; the frequency range of the phases is O.2-1.2Hz within which the velocity spectrum is in fairly high level. The results can be interpreted as surface waves excited in the thick sedimentary layer which covers the Tokyo area. Though the frequency dependence of phase velocity is cealy seen, it could not be confidently interpreted as a branch of unified single mode of surface wave. Rather, it is more likely to be interpreted as some branches of higher modes. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集