During the EUGENO-S field work in 1984 a large number of airgun shots was fired along a line between Larvik (Norway) and Lysekil (Sweden). The signals were recorded on land at Larvik using a stationary V-shaped land array with 48 recording channels. The airguns were fired every 300 m along the profile with an effective recording distance range of 30-150 km, but data quality deteriorated rapidly beyond 80 km. A hybrid variant of slant stacking was used in record analysis with the robust semblance technique for estimating velocity spectra. When the various P-traveltime branches were properly located in the τ- p plane, the inversion of the corresponding kinematic parameters to a 1-D velocity-depth model was minor. The main results are a presumed 5 km thick upper weathered layer with a velocity of 5.6 km s -1, a 5-13 km thick intermediate layer with a velocity of 6.3 km s -1, and a 13-31 km thick lower crustal layer with a velocity of 6.8 km s -1. The weathered layer is exceptionally thick, and the intermediate layer seems to typify the transition between upper and lower crust in a typical Oslo Graben tectonic setting.