A REMARK CONCERNING THE PROBLEM OF HOW TO PLACE THE REFERENCE PLANE (DATUM LEVEL) IN REFLECTION SEISMIC PROSPECTING*

It has been shown in a paper by L. Y. Faust that the wave velocity in rock depends on the depth below the ground surface according to a specified equation. It follows that the attitude of the planes of equal velocity is influenced by the topographic relief. Under these conditions the problem arises of how to place the reference plane in such a manner, that the fluctuations of the planes of equal velocity, that result from the fluctuations in the topography, shall not affect the results of the depth computations. In the present paper an analytical solution of this problem is given.