Figure 6
Mean velocities vs mean depths for boreholes that drilled Calcare Massiccio, Maiolica and Calcareous Scaglia. Green symbols are for Sonic logs data (SLV), Red symbols are for Check shot (IV). Vertical black bars indicate the thickness of each lithology drilled by the wells. Horizontal red and green bars represent respectively the IV data errors (2% following47) and the standard deviations of the SLV data. Colored (blue, green and orange) lines for each formation have been drawn following the equations reported in Supplementary Table S3 and the dashed lines represent the 90% confidence limit derived from such analysis. To infer the weighted best fit with an exponential function, the objective function implemented in Matlab has been applied to the available data. The procedure then gives the best coefficients (Supplementary Table S3) by minimizing the sum of square errors.
