Table 7 Standard deviation of model residuals for various GRNN models implying the initial, actual frequency amplification factors (RP, NP, TP cases, last three columns) for various combinations of site parameters
Number of parameters | Considered site parameters | Error (RP) | Error (NP) | Error (TP) |
|---|---|---|---|---|
All (6) | Depth + f 0 + V sm + C v +V s30 + V bedrock | 0.0011 | 0.0032 | 0.0053 |
3 (best triplet) | f 0 + C v + V s30 | 0.0079 | 0.0079 | 0.0118 |
2 (best pair) | f 0 + C v | 0.0251 | 0.0233 | 0.0278 |
2 (convenient pair) | f 0 + V s30 | 0.0782 | 0.0382 | 0.0339 |
1 (best) | C v | 0.0725 | 0.0652 | 0.0622 |
1 (usual) | V s30 | 0.1038 | 0.0715 | 0.0733 |
1 | f 0 | 0.099 | 0.0678 | 0.0563 |
Overall initial variability term \(\sigma_{\text{m}} \left( \theta \right)\) | 0.1178 | 0.0846 | 0.0896 | |