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A wide-angle reflection profile across the Iceland-Faeroe Ridge

Abstract A wide-angle reflection profiling (WARP) survey was carried out in July 1993 across the Iceland-Faeroe Ridge in the North Atlantic. Sleeve guns were employed as energy source and ocean bottom seismometers (OBS) used to observe the seismic energy. Results of the first evaluation show that the crust below the Iceland-Faeroe Ridge is stretched continental, with an average thickness of 23 km at its central part. Towards the NE end of the profile, the transition to oceanic crust of the Norwegian Basin has been identified. The upper crust has P-wave velocity (Vp) values which range between 5.8 and 6.3 km/s, while the lower crust is more homogeneous with Vp values between 6.7 and 7.0 km/s. The upper crust, excluding sediments and volcanics, is about 6 km thick at the crest of the ridge and thins with increasing water depths to the northeast and southwest. The lower crust can be separated from the upper part by a first order discontinuity, a PiP reflector, that has been identified in several travel-time sections. P-wave velocities below the Moho have values of approximately 7.9 km/s.