Empirical Estimation of Vs30 in High Intensity Area of Tangshan Earthquake

Based on the site conditions in the high intensity area of Tangshan earthquake,shear wave velocity test data from 701 field drill holes were selected and used to calculate the commonly used site classification indexes of Vseand Vs30respectively.Then the corresponding relationship between Vseand Vs30for the Tangshan area was initially established.Using the velocity gradient extrapolation method proposed by Boore,the empirical model and fitting parameters of Vs30in the Tangshan area were calculated by regression,and the results obtained by empirical models in four regions（Beijing,Xinjiang Urumqi,California,Japan Ki K-net）were compared.The results show that there is a strong correlation between the site classification indexes Vseand Vs30,and the empirical formulas obtained from data regression in different regions can get good prediction results,and can also provide references for the prediction of shear wave velocity models in areas with similar site categories.