強震記録の統計処理による基盤の強震動波形とその予測

抄録

A prediction technique of bed rock motions during strong earthquakes is studied using strong-motion accelerograms obtained at ground surface. The method is not due to the earthquake response analysis of soil layers, which is employed in general, but due to a statistical technique by which the nonstationary spectra of strong-motion earthquake records are scaled with the earthquake factors and local soil conditions. It is shown from the statistical analyses how the nonstationary characteristics of earthquake motions are affected by the factors of earthquake source as well as local soil conditions. By using the technique presented here, possible motions of bed rock can be estimated provided that the earthquake factors such as magnitude, focal depth and epicentral distance are available, and they agree comparatively well with recorded motions.