Abstract
It is well known that seismic ground motions are characterized by source, path and site effects. In order to estimate seismic intensity taking into account those effects, we propose a method to estimate site effects on seismic intensity based on site amplification spectra. Numerical and empirical analyses are performed to examine the relationship between site amplification spectra and increments of seismic intensity which is obtained from simulated motions, observed motions and questionnaire survey. It is clarified that the increments of seismic intensities can be evaluated by average values of site amplification spectra from 0.4Hz to 7.5Hz.
