Local site conditions are detected by different methods. To provide a first approximation of these conditions, an approach was developed to characterize potential ground motions based on known correlations between variations in shear-wave velocity and topographically-distinctive landforms by applying geomorphometry, a quantitative description of landforms based on DEMs . Wald and Allen (2009) described a methodology for deriving maps of seismic site conditions using topographic slope as a proxy [46][47][48]. Vs 30 measurements (the average shear-velocity down to 30 m) were correlated against topographic slope. They also favorably compared topographic slope-based Vs 30 maps with existing site condition maps based on geology. We converted the Vs 30 **data** into point-shape files, which served as a base for IDW (Inverse Distance Weighted) interpolations ( Figure 9). The resulting interpolation maps were overlain then with geologic and morphometric maps.