Abstract:The dynamic shear modulus ratio and damping ratio are two important parameters in seismic risk assessment and can directly affect the soil dynamics of engineering sites.The analysis of seismic hazards and soil layer seismic response showed that dynamic soil parameters were the key aspects that influenced the results of the analysis.In this study, 66 recent seismic risk assessment reports in the Tianjin area were collected, which contained representative and complete experimental data of soil dynamics parameters.Using two statistical methods, the dynamic parameters of experimental soils in these reports (e.g., silty clay, clay, silt, sand, silt soil, etc.) were statistically analyzed by depth and the average value of the dynamic shear modulus ratio and damping ratio.Next, the soil analysis models of two representative engineering sites (located at the Tianjin urban district and Tangu suburban district) were developed and the soil layer seismic response was calculated.The analysis showed that the two statistical values were representative and adaptable in the Tianjin area, and were more consistent with the practical measured values.Therefore, the two statistical values that were derived could be used to conduct the soil seismic response analysis for sites in which it was difficult to acquire undisturbed soil samples, especially for the thin interbed soil.