Abstract
Because the phase spectrum of an earthquake motion controls its nonstationary characteristics we take into account the spacial correlation of phase characteristics to interpolate the earthquake motions at unobserved points using observed earthquake motions. The regression equation to simulate phase spectra is derived as a function of rupture length and epicentral distance using the observed earthquake motions during the Chi-Chi earthquake (1999). Using a sample phase spectrum and the concept of the Kalman Filtering, we developed a method to simulate earthquake motions at unobserved points.
