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Glossary:Velocity gradient
-In the context of seismic, velocity gradient is usually the vertical velocity gradient, i.e., the rate of change of velocity of sound traveling through rock with depth. Normally, it refers to seismic velocity at seismic frequencies, i.e., smoothly varying (rather than rapidly varying, as with a sonic log).
-With respect to material being sheared, velocity gradient is the change (dv) in relative velocity (v) between parallel planes with respect to the change (dz) in perpendicular distance (z) throughout the depth of the material. Velocity gradient has the same dimensions as rate of shear, which is reciprocal seconds.