Figure 2. P-wave velocities (V_p) measured at 10 MPa confining pressure vs. (A) porosity and (B) grain density for the basaltic samples used in this study. A least-squares-fit (solid line) is shown along with one standard deviation bounds (dashed line) for (A) and (B). The standard deviations for the fits to (A) and (B) are 0.04 and 0.17 km s^-1 respectively. The correlation between V_p and porosity suggests that the distribution of pore shapes within the samples does not vary much between the samples.