Abstract
This paper deals with strong-motion peaks in terms of seismic source, propagation path and local site conditions. Especially emphasis is placed on the effect of local site conditions. Peak acceleration, peak velocity and peak displacement are analyzed in a similar fashion because they are interrelated. A semi-empirical model is first derived with the aid of seismic source theories and then applied to strong-motion records obtained in Japan. The resulting semi-empirical expressions for the peak acceleration, velocity and displacement are compared with strong-motion data observed during the 1989 Loma Prieta, the 1985 Michoacan and the 1971 San Fernando earthquakes. The semi-empirical expressions explain well the observed strong-motion data in other countries even though they were obtained based solely on Japanese data.
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