Abstract
The characteristics of the duration, total power, and rms value of strong earthquake ground motions are investigated with the aid of the wave propagation theory and statistical technique. It is made clear from some theoretical estimations how the duration and its related parameters are affected by the soil layer conditions. A new multiple regression analysis which includes not only the earthquake factors but also the local site conditions as its independent variables is developed and applied to the duration and its related parameters using strong-motion earthquake records. By combining the theoretical and statistical results, semi-empirical expressions are derived in order to predict the duration and its related parameters.
