Fig. 6From: Deriving amplification factors from simple site parameters using generalized regression neural networks: implications for relevant site proxiesAverage amplification factors as a function of normalized frequency for each set of soil profiles. a RP (top), b NP (middle), and c TP (bottom). Thin blue lines correspond to every site profile, the thick red line is the geometrical average over the whole profile set, and thick light blue lines are average ± one standard deviationBack to article page