. Early geophysical papers of the Society of Exploration Geophysicists . POtNT or REFLECTtON V Fig. 5.—Path of reflected wave. where Z is the depth, 1" is the average velocity from the surface to the reflecting stratum, T is the time of travel mentioned, and X is the dis- tance between shot and recorder points. The average velocity through the medium above the reflecting layer is a function of the depth of this layer. As a result, the path of the dis- turbance is not a straight line as shown in Figure 5, but is curved as shown by the full line in Figure 6. For simplicity the straight path
. Early geophysical papers of the Society of Exploration Geophysicists . POtNT or REFLECTtON V Fig. 5.—Path of reflected wave. where Z is the depth, 1" is the average velocity from the surface to the reflecting stratum, T is the time of travel mentioned, and X is the dis- tance between shot and recorder points. The average velocity through the medium above the reflecting layer is a function of the depth of this layer. As a result, the path of the dis- turbance is not a straight line as shown in Figure 5, but is curved as shown by the full line in Figure 6. For simplicity the straight path is used in all of the diagrams. The average velocity may be accurately determined by lowering a recording instrument into a well and shooting charges on the surface. A velocity so determined may be used in a large area. As a 39
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