Fig. 9: Coast-parallel seismic section illustrating contrasting types of basement.
From: The North Sea rift basement records extensional collapse of the Caledonian orogen
a South-dipping reflective crust interpreted as Baltica crust, possibly with Baltica-derived Caledonian nappes in the upper part, overlain by seismically more transparent units interpreted as Caledonian allochthonous units. b Same section through a coherency (semblance) cube, where coherency relates to the degree of similarity between waveforms. Green color indicates high coherence, or low degree of lateral seismic waveform similarity, and characterizes the allochthonous units. Inline NVG5400 along the E margin of the Utsira High. See Fig. 7 for location. P Permian sedimentary rocks. BCU Base Cretaceous unconformity.
