Abstract
Abstract Over the last few decades, a number of wide-angle seismic experiments have been conducted in the Faroe–Shetland Channel area with the objective of mapping the crustal structure. However, the volcanic rocks covering most of the area present a challenge for the imaging of sub-basalt structures. The results of the seismic studies are consistent in describing the Faroe–Shetland Channel as thinned continental crust and in establishing the presence of sub-basalt sediments. However, the various datasets often show differences in depth to crystalline basement and to the Moho. This paper presents a review of the velocity models in the Faroe–Shetland Channel and analyses the differences at line intersections. Down to top basalt the models are fairly consistent, while there are deviations of up to 1 km s −1 in basalt velocities and sub-basalt sediment velocities, 2 km in basalt thickness, 3.2 km in depth to crystalline basement, and 11.7 km in depth to the Moho.
Highlights
The Faroe–Shetland Channel (Fig. 1) is characterized by Palaeogene volcanic rocks associated with the North Atlantic Igneous Province and the breakup of the North Atlantic (Larsen et al 1999)
This paper presents a review of the velocity models in the Faroe–Shetland Channel and analyses the differences at line intersections
We review all velocity models in the Faroe –Shetland Channel that are based on seismic refraction data, and some of them on gravity data, acquired since 1994
Summary
The digital models were obtained by converting the colour values according to the colour-scale bar in figures (FLARE and Mobil surveys), by reading velocity contours (iSIMM line) or by converting annotated velocity models (AMG95 and FAST surveys). The location of the models is based on digital navigation (FAST, FLARE and iSIMM surveys) or on digitized location maps. The FAST, FLARE and iSIMM surveys use conventional semblance analysis techniques on reflection seismic data for modelling the post-basalt sediments and the top basalt interface. The FLARE, FAST, AMG95 and AMP-D surveys integrate gravity data in the modelling. This includes the depth to crystalline basement and the Moho, as well as the thickness of the basalt sequence and the underlying sediments. With the exception of FLARE lines 2 –12, all velocity models infer Moho for the full length of the profiles, even though large sections of the VELOCITY MODELS IN THE FAROE–SHETLAND CHANNEL
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