Hybrid Slip Model for Predicting Near-field Strong Ground Motion

A hybrid slip model combined an Asperity model and k model for predicting near-field strong ground motion is proposed in this paper. Firstly, the asperity model charactering lower wave number of slip distribution is estimated based on works of Wang (2004), Wang and Tao (2004a, b). Secondly, k square slip model charactering higher wave number of slip distribution was determined based on research results of Gallovic et al (2002) and Wang (2004). Finally, the slip distribution on the rupture surface is merged by the spatial wave number spectra from asperity model with that from k square model, a hybrid slip model is then turned out. To validate reliability and practicability of the hybrid slip model, 1994 Northridge earthquake, California is taken as an example. The acceleration time histories on three rock stations for an earthquake with magnitude Mw6.7 are predicted, and records at the same sites during the 1994 Northridge earthquake are compared.