Simulation of near-fault strong-ground motion using hybrid Green's functions

The recently proposed hybrid Green's function method is designed to combine the advantages of both deterministic and stochastic approaches to simulati ng broadband ground motion when records of small events are not available. The method has the flexibility of incorporating complexities in the source, wave path, and local-site effects into strong ground motion simulations. I n this article we analyze its effectiveness at simulating near-fault ground motions by comparisons with the empirical source time function method, emp irical ground-motion-attenuation relations, and recorded near-fault ground motion. We present a simple model for introducing the effect of the radiati on pattern to the stochastic Green's functions in the intermediate frequenc y range (1-3 Hz), The numerical test results of the method and the generall y good agreement between simulated and recorded ground motion from the 17 J anuary 1995 Kobe earthquake shown in this study indicate that the technique has the capability of reproducing the main characteristics of near-fault g round motion.