. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 6.—Curvature of path due to increasing velocity with depth. matter of fact, as the accurate determination of relative depths is of greatest importance, it is generally possible to assume an approximate velocity which meets the general requirements of accuracy for absolute depths. Where a well is available, it is possible ito check this velocity without lowering a recording instrument into it provided the reflecting strata are not too close together, and the reflections may therefore be definitely identified. In gener
. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 6.—Curvature of path due to increasing velocity with depth. matter of fact, as the accurate determination of relative depths is of greatest importance, it is generally possible to assume an approximate velocity which meets the general requirements of accuracy for absolute depths. Where a well is available, it is possible ito check this velocity without lowering a recording instrument into it provided the reflecting strata are not too close together, and the reflections may therefore be definitely identified. In general, in the course of a shooting program, wells are thus checked as they are encountered. An approximate velocity may be determined by arranging several instruments in profile. The foregoing equation of the path of the disturbance is obviously a linear equation between X2 and T2. Thus, if X2 is plotted against T2, the straight line obtained has a slope equal to V2. The velocity may thus be deter- 40
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