CHARACTERISTICS OF SEISMIC WAVE ENERGY IN AN ATTENUATION RELATIONSHIP

Abstract

The characteristics of seismic wave energy are examined in this study. We proposed the attenuation equation of seismic wave energy with respect to moment magnitude and equivalent hypocentral distance on the basis of seismic records in Japan. By evaluating the dispersion of attenuation relationship and the difference of main shock and aftershock, the seismic energy is shown to be a more stable index than PGA and PGV to estimate the seismic intensity. The frequency distribution of seismic wave energy is also examined using the wavelet transform analysis. The frequency distribution of seismic wave energy obtained agrees with the omega-square source model. It is concluded that the seismic wave energy is a rational index to estimate the seismic intensity.