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The most universally accepted method of converting travel-times of reflected events to subsurface depths is that embodying the use of the so-called time-depth charts. After a set of reflection records have been studied for traveltimes and what we might term “correlatability,” and after corrections for weathering and low-velocity layer have been applied, the resulting travel-times of the reflections are interpreted in terms of depth by means of such charts.

As a result of what we have learned in our preceding lessons, we are now in a position to discuss the simplest form of these time-depth charts, which is also the most useful and important. If we assume that the reflection has come from a horizontal bed at a depth h with a uniform velocity v, the travel-time t is given, as we have seen, by the relation in which x is the distance from the shot-point to the receiving point.

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