Deriving amplification factors from simple site parameters using generalized regression neural networks: implications for relevant site proxies

Earth, Planets and Space

Table 4 Initial variability values for the amplification factors in the normalized frequency domain for the RP, NP, and TP profile sets

Data set	RP–NF	NP–NF	TP–NF
Total initial variability \(\sigma_{\text{m}}\)	0.1060	0.0724	0.0714
Maximum initial variability \(\sigma_{ \hbox{max} }\)	0.1736	0.1187	0.1268
σ (f/f ₀ = 0.05)	0.0261	0.0183	0.018
σ (f/f ₀ = 0.1)	0.0301	0.0215	0.024
σ (f/f ₀ = 0.2)	0.0373	0.0269	0.029
σ (f/f ₀ = 0.4)	0.0600	0.0378	0.0418
σ (f/f ₀ = 0.7)	0.1305	0.0904	0.1020
σ (f/f ₀ = 1.0)	0.1673	0.1149	0.1228
σ (f/f ₀ = 2.0)	0.1473	0.1101	0.1074
σ (f/f ₀ = 4.0)	0.1281	0.0912	0.0908
σ (f/f ₀ = 7.0)	0.1248	0.0829	0.0741
σ (f/f ₀ = 10.0)	0.1239	0.0794	0.0682
σ (f/f ₀ = 20.0)	0.1312	0.0833	0.0712