Abstract
Site amplification factors are empirically evaluated as ratios of ground motion amplitude recorded at nearby station pairs. The factors decrease when pseudo efficient strain evaluated by 30m shear wave velocity and peak ground velocity exceeds 0.0003 and they in the periods range 0.15 to 0.2 seconds decrease more significantly than other periods. We develop empirical models to estimate nonlinear site amplification factor for 5% damped response spectral acceleration, peak ground acceleration and velocity. These proposed models show consistency with existing methods.