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WesternGeco acquired and released the Mississippi Canyon dataset for public use.
Proof of Equivalence with Levin and Shah's Traveltime Equations for Small Dips
In the following appendix, I show in that the approximate traveltime equation
for pegleg multiples in a nonflat earth, equation (3), is
a valid first-order approximation of Levin and Shah's
1977 true raypath.
Stanford Exploration Project