a Alinejad Taheri - M.Sc student, Faculty of Engineering, Guilan University, Rasht, Iran
r Jamshidi Chenari - Assistant Professor, Faculty of Engineering, Guilan University, Rasht, Iran

stiffness of natural soil deposits represented by shear modulus is the most important property for evaluating the dynamic responses of soil structures at different sites . Seismic waves filtered as they pass through soil layers from bedrock to surface change frequencies and amplitudes and these modifications result in different ground motion charateristics

seismic wave propagation, inherent variability , shear modulus , monte carlo simulation , natural alluvial deposits