Abstract：The space distribution of inhomogeneous dislocation on the fault has strong influence on the strength and spatial change of the near-field strong ground motion. The parameters of finite faults source model were divided into global source parameters and local source parameters. Global source parameters describe the macro feature of the fault, and local source parameters describe the inhomogeneous distribution of dislocation on the fault fracture surface. In order to describe the inhomogeneous distribution of the fault，assuming that fault subevents division has nothing to do with the seismic moment, fractal method is used to delimit the subevents to avoid overlapping or covering；assuming that stress drop is not constant to correct self-similar model，the relation between subevents and fault was getted to improve of existing asperity model. Finally taking the northridge earthquake for example， the inhomogeneous distribution of the fault was predicted to verify the validity of the prediction model compared to actual situation after the earthquake.
2014, Vol. 33 
