Applicability study of the GP fault rupture model in strong ground motion simulation for the Qinghai Menyuan Ms6. 9 earthquake

On January 8, 2022, a Ms6. 9 earthquake struck Menyuan County, Qinghai Province. The vicinity of the epicenter suffered strong seismic damage. To verify the ability of the GP fault rupture model developed by Graves and Pitarka in predicting and evaluating the ground motion field in China before the earthquake, this paper performs deterministic ground motion simulations of the Mengyuan earthquake based on the GP method, considering the effects of different rise time coefficients (rc). The simulation results were compared with the ground motion prediction equations of Qinghai -Tibet region, the strong -motion observation records and the intensity maps automatically generated from the strong -motion records in terms of ground motion attenuation pattern, waveform and amplitude, and intensity distribution, respectively. Comparing the waveforms of simulated records from a near-field station and strong earthquake records. The results show that when the rc is 9. 0, the simulated records are in good agreement with the measured records and the ground motion prediction equation. This paper reproduces the strong motion field of the Menyuan earthquake. The GP method can be applied to the prediction and estimation of the strong ground motion field before the earthquake in China with a reasonable selection of rc.