Magnetic measurements and seismic profiling in the Skagerrak

The results of aero-magnetic measurements in the Skagerrak and of seismic profiling outside Kristiansand are presented.Characteristic magnetic features which are observed on the Norwegian mainland along the Skagerrak coastline can be followed into the Skagerrak (Figure 12).The seismic profiling off Kristiansand shows that the unmetamorphic sedimentary rocks found beneath the Skagerrak form a wedge-shaped border zone with the crystalline basement rocks on the landside. The magnetic measurements indicate that a wedge-shaped border zone may also exist all along the Norwegian Skagerrak coastline and along the Fennoscandian border zone (Figures 5 and 12).The basement depths in the Skagerrak, which are calculated on the basis of the magnetic records, show a maximum depth of over 6000 m (Figure 5).The distribution of the quaternary sediments in the Norwegian Channel supports the theory that glacier activity has played an important role during the formation of the Norwegian Channel.Paper No. 8 of the Working Group on the Skagerrak Project.