Fig. 14From: Deriving amplification factors from simple site parameters using generalized regression neural networks: implications for relevant site proxiesVariation in the short-period Borcherdt factor F a with V S30 (horizontal axis, log scale) and f 0 (vertical axis, log scale) for RP–RF (a, top), NP–RF (b, middle), and TP–RF (c, bottom). Values of F a are provided by the color scale on the right of each plotBack to article page