Figure F91. Average P-wave velocity in gabbros and peridotites from Hole 1268A, compared with seismic profiles (Vera et al., 1990; J. Collins and R. Detrick, pers. comm., 1998) and velocity-depth profiles for oceanic gabbros and ultramafic rocks inferred from laboratory studies. MAR = Mid-Atlantic Ridge, EPR = East Pacific Rise.