掲載雑誌（和）： 岩盤力学に関するシンポジウム講演論文集 Vol： 21巻 年： 1989年 頁： 131-135頁 著者（和）： 平田　篤夫，　金子　勝比古，　大見　美智人 タイトル（和）： 伝播波動初動形状による地盤の波動減衰特性の評価法 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF THE SYMPOSIUM ON ROCK MECHANICS 著者（英）： Atsuo HIRATA, Katsuhiko KANEKO, Michito OHMI タイトル（英）： TECHNIQUE FOR ESTIMATION OF SEISMIC WAVE ATTENUATION IN THE GROUND BY THE SEISMIC PULSE FORM 抄録（英）：
A simplified technique for estimation of the seismic Q of the ground is presented and discussed. At first , relations between the rise time and the propagation time and between the pulse width and the propagation time are analyzed based on the constant Q theory proposed by Kjartansson(1979). The relations are expressed by linear equations in the case that the source displacement is represented by the impulse function or the impulse response function. On the other hand , those are expressed by nonlinear equations in the case the source displacement is represented by the arbitrary continuous function. These equations indicate that Q value of the ground could be estimated by analyzing the seismic pulse-form. Secondary , how to apply the equations to the field data is discussed, introducing a new factor, namely, the pulse ratio. The pulse ratio is defined by the ratio of the rize time to the pulse width. From the theoretical analysis, it is made clear that the pulse ratio is independent to the propagation time and Q, and has a constant value 0.37 for the impulsive or impulse-responsive displacement source. However, the pulse ratio depends on the propagation time and Q for the arbitrary displacement source. It is concluded that the linear equations are applicable only if the pulse ratio observed is constant and equal to 0.37 , and that nonlinear equations should be used if the pulse ratio varies depending on the propagation time and Q. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集