Abstract
The authors present a method to evaluate ground motions at a site which is based upon the site specific experimental spectral amplitude and phase characteristics for horizontal and vertical ground motions based on records at the observed site. The time domain characteristics are now given by the site specific phase spectra rather than a standardized envelop curve in time domain which has been a common practice to obtain time history. The recorded motions in Japan are used to obtain the synthesized Green's functions and predicted waves by summing this Green's functions were compared well with the recorded motions including 1995 Hyougo-Ken-Nanbu earthquake. The method is expected to expand the ability of estimation of strong ground motions to vertical motions to improve the phase characteristics.
