We have examined a large number of standard marine refraction stations to determine the general relation of crustal and mantle velocity to spreading direction and age in the Pacific. Crustal anisotropy is insignificant, as is variation of lower crustal velocity with age. Mantle velocities exhibit a high correlation with both age and azimuth indicating an increase of velocity with age and about 5% anisotropy with highest velocity in the direction perpendicular to the local magnetic anomalies.