Figure F66. Crossplots of physical property data, derived from samples used for MAD property determination. For illustrative purposes, only z-axis P-wave velocity is compared—horizontal velocities yield virtually identical results. In all cases, alteration (on a sample scale) will tend to decrease compressional wave velocity. A. Negative correlation between porosity and bulk density. As porosity decreases, the variability in bulk density for samples with similar porosities also decreases, likely resulting from variations in alteration and mineral precipitation within the open pore spaces. B. Strong inverse correlation between porosity and grain density. The variability in vertical velocity also decreases with decreasing porosity. C. Correlation between compressional velocity and grain density, showing a slight positive trend.
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