Abstract
We propose a method to theoretically estimate response spectra at the points where the seismic records are not available during earthquakes. Spectral characteristics of earthquake motions at the ground surface are evaluated considering effects of rupture process of faults and the nonlinear amplification through shallow ground. The expected value of maximum response acceleration of a single-degree-of-freedom system is evaluated by using spectral moments of the predicted motion in frequency domain. We apply the method to estimate the acceleration response spectra at several points in the severely damaged area during the 1995 Hyogoken-Nambu earthquake. A method is also proposed to modify the theoretical response spectra with observed seismic records.
