A method of determining stacking velocity Vs and the depth of a reflector z from the arrival-time versus offset relationship:
If x2 is plotted against t2, the slope gives the inverse of the velocity squared and the depth can be obtained from the intercept. Applies only to a constant velocity medium. Because of the variation of velocity with depth, x2-t2 curves are not perfectly straight lines. For horizontal velocity layering and horizontal reflectors, the stacking velocity Vs is given by the slope at the origin. See also velocity and Sheriff and Geldart (1995, 86, 134).