The initial rupture point location is a crucial input parameter for the simulation and prediction of strong ground motions.To further delve into the impact of the initial rupture point on the results of strong earthquake simulations,this study integrates the non-uniform asperity model into the random finite fault method to simulate the strong ground motion of the 1932 Changma earthquake.The results demonstrate that the Peak Ground Acceleration(PGA)at the epicenter exhibits significant variations with the change in the location of the initial rupture point,with most of the initial rupture points generating high PGA values distributed on the left side of the fault.The influence of the initial rupture point on the spatial distribution of PGA≥800 cm/s2 within the region is limited,while it significantly impacts the spatial distribution of PGA values ranging from 100 cm/s2 to 200 cm/s2.The effect on the attenuation relationship between PGA and source distance is substantial,with the results from the initial rupture points located towards the right of the middle and lower parts of the fault aligning well with the predictive model of the seismic ground motion parameters zonation map of China.The findings regarding the impact of the initial rupture point on the response spectrum reveal that the impact on the response spectrum at the epicenter is slight.The study on the spatial distribution of the response spectrum for different periods reveals that the distribution of response spectrum values shows a decaying trend as the period increases.The variation in response spectrum value distribution with the period is significantly different for the initial rupture points located at the bottom of the fault compared to other locations.The findings elucidate the impact of the initial rupture point location on PGA and the response spectrum within the research area of the Changma Earthquake,offering a reference for the selection of the initial rupture point on the fault.
维普
万方数据