Impact of coseismic deformation fields with different time scales on finite fault modelling in 2010 California Baja Earthquake

Abstract

In this study, the static coseismic deformations with different time scales in the target event are extracted from the long term and short term solutions of continuous GPS and the epoch-by-epoch solution of high rate GPS respectively. The mean discrepancies among these deformations are less than 1 cm. The earthquake source parameters are inverted in the layered inhomogeneous half-space under the static dislocation theory from the static coseismic displacements with different time scales. It can be concluded that the time scale of the static coseismic displacement shows a relatively small impact on the source parameters in this moderate earthquake. The disturbances on the fault slips are less than 20 cm, and less than 0·1 on the moment magnitudes. As the time scale grows, the postseismic deformation in the static coseismic displacement from the short term solution increases, which indicates that apparent early postseismic displacements exist on the day after the termination of the earthquake.