11:30 AM - 11:45 AM
[S13-6-05] Investigating the variability of near-source ground motions using pseudo-dynamic source models at the SCEC Broadband Platform
The accurate prediction of ground motion intensity and variability is a critical element in seismic hazard assessment. Especially it is important to note that the variability of ground motions plays an important role in probabilistic seismic hazard analysis (PSHA) since the exceedance probability of ground motions is taken into account. Physics-based source and ground motion modeling has become popular, given advanced earthquake rupture and wave propagation modeling schemes and fast growing computing capability. There have been intensive community efforts to construct a physics-based broadband ground motion simulation platform, supported by the Southern California Earthquake Center (SCEC). Using various pseudo-dynamic source models at the SCEC broadband platform, I investigated the variability of near-source ground motions. Preliminary results show that the variability of low frequency ground motions is relatively compatible with the variability of empirical ground motion prediction equations (GMPEs) while the variability of high frequency ground motions is not. We may need to pay more attention to the variability of ground motions by considering the variability of input models when we construct a physics-based ground motion simulation platform.