. Early geophysical papers of the Society of Exploration Geophysicists . StcMtJrrSHJZ/' sxsr UAiesrcwE Vf=5BM Fig. 4.—The time-travel curves obtained from actual data taken from records shot in an area in West Texas, and the resulting profile calculated according to the method described in this paper. cordingly. With this action accomplished, the procedure is the same as for the case of a single dipping layer. The dip angle calculated in the usual manner will be the angle of dip between the surfaces of the Vz and Vi beds, and the values of h and k will be the thickness of the V3 bed under the

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. Early geophysical papers of the Society of Exploration Geophysicists . StcMtJrrSHJZ/' sxsr UAiesrcwE Vf=5BM Fig. 4.—The time-travel curves obtained from actual data taken from records shot in an area in West Texas, and the resulting profile calculated according to the method described in this paper. cordingly. With this action accomplished, the procedure is the same as for the case of a single dipping layer. The dip angle calculated in the usual manner will be the angle of dip between the surfaces of the Vz and Vi beds, and the values of h and k will be the thickness of the V3 bed under the secondary s hot points on the surface of this bed. The true velocity of F4 can be calculated in the same manner as Vz was previ- ously determined; and if the result is not in good agreement with the assumed value of Vi} a new value for this quantity can be assumed and the entire procedure repeated. A high degree of accuracy can be 787

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