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3-D Prestack-migration of Wide-angle Data from a Variscan Transition Zone

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Abstract

—In addition to the near normal-incidence observations within the German DEKORP 2 project in 1984, wide-angle observations have been carried out on a parallel profile across the boundary between the Saxothuringian and Moldanubian crust, approximately 50 km NE of the main transect to control three-dimensional variations. Explosion sources have been used for the entire survey, providing excellent conditions for wide-angle registrations. A velocity model has been derived on the basis of in- and off-line refraction measurements using a kinematic raytracer which was extended to three dimensions by interpolation of 2-D velocity fields between parallel sections. Although prestack-migration of the data led to aliasing effects due to large shot and geophone spacing, stable results were obtained by forming envelopes after single-shot migration. The migrated sections reveal a strongly reflective Moho at about 31 km depth and a steeply (50°) dipping intracrustal reflector, which seems to be related to the border between the two Variscan units.

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Received February 12, 1998, revised December 18, 1998, accepted December 28, 1998

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Bleibinhaus, F., Bopp, M., Simon, M. et al. 3-D Prestack-migration of Wide-angle Data from a Variscan Transition Zone . Pure appl. geophys. 156, 173–186 (1999). https://doi.org/10.1007/s000240050295

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  • DOI: https://doi.org/10.1007/s000240050295

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