抄録
This paper presents several indices to evaluate the behavior of ground that are going to liquefy by using the behavior of Port Island during the 1995 Hyogoken-nambu earthquake. Waves were separated into narrow frequency range by means of wavelet transform in order to discuss the behavior with respect to frequency. An amplification factor defferenciated by a wave velocity is found to be a good index to evaluate an important frequency range for the nonlinear behavior of individual layers. A product of an peak accekeration and peak velocity is proposed to be a good index of the ground motion in order to evaluate the behavior on the process to liquefaction. The importance of Rayleigh damping on evaluating the behavior of ground on the process to liquefaction is pointed out because higher frequency response suprressed very much by Rayleigh damping.
