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Often there is a knowledge of the overburden velocity-depth relationship. This knowledge can be incorporated into a nomogram utilizing the conventional reflection wavefront chart which is then used to calculate the refractor velocity, dip, and depth from the observed apparent velocities and total travel-times of reversed refraction profiles.

The nomogram gives the relationships between the dip of refractor, the velocity of refractor, the depth, and the apparent velocity observed at the surface. It also permits a simple calculation of the total traveltime once the position and velocity of the refractor are estimated or assumed. Hence, the nomogram can be used for successive approximations.

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