For a medium where velocity increases exponentially with depth, V(z) = V0 e^(lambda z), the one-way vertical travel time to depth z is obtained by integrating dz/V(z), and the two-way (reflection) travel time is twice this value.
One-way travel time to the point of maximum depth (V1 = V0 e^(lambda z1)) is t = integral from 0 to z1 of dz/(V0 e^(lambda...
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