Probabilistic approach for seismic microzonation integrating 3D geological and geotechnical uncertainty

A novel probabilistic methodology for regional seismic site characterization is proposed and applied to a region with highly heterogeneous surficial geology varying soil sediment thickness stiffness. The method combines various sources of geological geotechnical uncertainties develop three-dimensional (3D) shear-wave velocity ( V s ) model evaluate the associated uncertainties. 3D unconsolidated deposits was developed using geostatistical interpolation simulation methods. Sequential indicator simulations produced quantitative geologic that explicitly quantified based on likelihood specific types occurring. In situ measurements multivariate statistical analysis allowed development empirical correlations between , parameters, depth, types. resulting values were estimated basis -depth probability occurrence each type. this approach, propagated uncertainty also by considering combined variance. Seismic microzonation mapping then conducted transforming into two-dimensional (2D) maps represent spatial distributions time-averaged top 30 m fundamental period T 0 ), along their respective Monte Carlo simulations. results indicate are influenced thickness, probability, properties soils. can be used assess risk at local scales in areas geologically geotechnically complex properties.