Abstract
A 10‐km‐long uncorrelated Vibroseis data set was processed to test the feasibility of using industry reflection data for deep crustal imaging in the Peace River region and elsewhere in the Western Canada Sedimentary Basin. These results were compared with a crustal refraction interpretation of a line ∼10 km to the north. The Vibroseis data were extended from a conventional 3 s to 14 s two‐way travel time using the self‐truncating‐sweep method. The reflection section contains a prominent eastward‐dipping event at ∼9.4 s (29 km depth) which corresponds to the zero‐offset two‐way travel time of an intracrustal boundary in the refraction model. This may represent the Riel discontinuity imaged at similar depths in southern Alberta. A series of near‐vertical incidence reflections over 1–1.5 s terminating at 13 s corresponds well with the refraction Moho at 12.8 s (41 km depth). This suggests that locally, the crust‐mantle boundary is a complex, possibly layered transition zone of 3–5 km thickness.
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