The specific barrier model: Its calibration to earthquakes of different tectonic regions and the synthesis of strong ground motions for earthquake engineering applications.

摘要

The specific barrier model, proposed and developed by Papageorgiou and Aki (1983a,b, 1985) provides the most complete, yet parsimonious, self-consistent description of the faulting process of the earthquake source. It applies both in the "near-fault" as well as in the "far-field" region, thus allowing for consistent ground motion simulations over the entire frequency range and for all distances of engineering interest. The model effectively captures the essential characteristics of more complex seismic sources. Using the stochastic modeling approach, the model has been calibrated using databases of response spectral amplitudes from earthquakes of intra-plate regions, inter-plate regions, and regions of tectonic extension. Inter- and intra-plate source spectra show similar high-frequency levels at moderate magnitudes but intra-plate earthquakes have higher spectral levels at the larger magnitudes. Inter-plate soil residuals clearly exhibit nonlinear site response. The model calibrated in this study is in a reasonably good agreement with other regional attenuation relationships proposed in the literature. The application of the specific barrier model for site-specific simulations of strong ground motions has been demonstrated for scenario earthquake events consistent with the seismic hazard. The model has successfully been applied for the strong ground motion simulations of two historical earthquakes using the stochastic and kinematic modeling approaches. The results of this study provide a reliable and physically realistic, yet computationally efficient, way to model strong ground motions with implications for seismic hazard and risk analysis. The models have been implemented into computer codes that have been made available over the Internet.