The structure of the Faeroe-Shetland Trough from integrated deep seismic and potential field modelling

In the Faeroe-Shetland Trough, thick basaltic lava units make it difficult to image underlying structure with conventional seismic profiles. We have t herefore used potential field modelling to estimate crustal structure along the FAST deep seismic Line and other regional transacts, We introduce the additional constraints of crustal isostasy to gravity models and the observ ations of the polarity: of magnetic remanence within the lava pile to magne tic models. The crustal stretching factor ranges up to 3 along the FAST tra verse, and our model also suggests that a sedimentary section with a thickn ess of up to 3-4 km is present beneath a c. 2 km basalt laser on the Faeroe se shelf.