Difference of ground motion caused by site conditions near the ground surface makes seismic hazard disparity.In order to assess the impact of surface site conditions on seismic hazard prediction and long-term development program in Min-Zhang region

aground motion variability calculation method is proposed by combining V

s30

and frequency-scaled topographic curvature as properties for site effective amplification.This study shows:although PGA of ground-motion varies with the soil thickness and topography

the descending sequence of ground motion variability is soil hill

soil valley

rock hill and rock valley.Gen

erally

the amplification factor of ground motion is correlated with V

s30

that is

higher V

s30

is corresponding to a lower amplification factor.In frequency domain

the amplitude of seismic spectrum

which depends on both V

s30

and frequency-scaled topographic curvature

amplifies obviously at the characteristic frequency.This study can offer a theoretical foundation for assessment of the seismic hazard prediction and longterm development program in the study area

and the proposed method can also be used in rapid reporting of seismic intensity and seismic disaster assessment.