A piggy-back seismic reflection survey was carried out in 1984 as part of the DEKORP 2-S profile. The signal from explosive-sources was digitally recorded on 120 channels. The objectives were: a) To record crustal reflections at a wide range of incidence angles (5-85 km offset) b) To provide 3-D control of deep crustal reflectors seen on the main profile.

An important consideration throughout the fieldwork was to avoid interference with the main reflection survey. This experiment showed that explosive charges as small as 5-90 kg may provide sufficient energy for observations from the steep-angle to the wide-angle range. The off-line position of the receivers allowed the reconstruction of steep-angle reflection profiles parallel and perpendicular to the main reflection line. A strong diffraction cluster on the main line could be correlated laterally, and indications about the diffractors' shape could be obtained.