It is not usually possible to obtain accurate fault parameters after an earthquake,and this has a negative effect on the ability to make a rapid assessment of ground motion intensity after an earthquake when using a ground motion simulation method.Two earthquakes that occurred in western USA were selected for simulation using two different methods.Parameters such as strike,rake,dip,and focal depth were varied and the influence of the different fault parameters on the ground motion intensity index and value of response spectra were analyzed,and the accuracy of the different methods was determined.Results of simulations show that the GP method provides values that are closer to observed values than the EXSIM method.In comparison with the errors caused by the simulation methods,the influence of fault parameters on the simulated results is small within a reasonable error range of different fault parameters.It is thus considered that fault parameters through rapid inversion can be used in ground motion simulation for a rapid assessment of seismic intensity.