Figure F38. A. Hole 1173A PWS P-wave velocity. B. Horizontal and vertical P-wave velocity as a function of porosity. The line represents a typical relationship for clayey silt computed from a weighted average equation using a matrix velocity of 4500 m/s and a weighting parameter of 1.1 (Lee et al., 1996). C. P-wave velocity anisotropy. The vertical plane anisotropy compares velocity along the two transverse axes (x and y) to that parallel to the core (z), whereas the horizontal plane anisotropy compares velocity of the x- and y-axes. Because cores are randomly rotated, horizontal plane anisotropy should average zero.