Dictionary:Fig W-3

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Segw3.jpg

FIG. W-3. Wavefront charts. (a) Wavefronts for a particular velocity function become farther apart with depth because of the increase of velocity with depth. Raypaths are orthogonal to wavefronts. (b) Wavefronts where velocity increases from right to left as well as with depth. (Courtesy Chevron Oil Co.)