In the Faeroe–Shetland Trough, thick basaltic lava units make it difficult to image underlying structure with conventional seismic profiles. We have therefore used potential field modelling to estimate crustal structure along the FAST deep seismic line and other regional transects. We introduce the additional constraints of crustal isostasy to gravity models and the observations of the polarity of magnetic remanence within the lava pile to magnetic models. The crustal stretching factor ranges up to 3 along the FAST traverse, and our model also suggests that a sedimentary section with a thickness of up to 3–4 km is present beneath a c. 2 km basalt layer on the Faeroese shelf.

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