Figure 3.
(a) Synthetic OBS gather for a 1D-gradient model with a water depth of 5 km. (b) Synthetic OBS gather after redatuming to the seafloor via DC. Panels (c) and (d) show ray tracing models corresponding to panels (a) and (b), respectively. First arrival refractions at offsets |$<$|8 km, mapping the shallow subseafloor structure, occur only in panel (d).