41 2. Refraction surveying refractor and the generalized time-depth curve. The t − curve (Figure 2.4, bottom) can be approximated by a straight line, the slope of which gives the velocity of the refractor, which was found to be 3,350 m/s. The slope of the direct wave gives the velocity V1 of the medium situated above the refractor. The medium situated above the refractor is defined as the weathering zone (Wz). Its velocity was found to be 850 m/s. The generalized time-depth, tG, also called delay time, shows the shape in time of the refractor (Figure 2.4, bottom). Figure 2.4 Example of a refraction survey with the Plus-Minus method.
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