GlyVeST: Glyvursnes-Vestmanna Seismic Tie, a Land and Marine Seismic Profile

Abstract

Combined marine and land controlled-source seismic data acquisition was carried out in the Faroe Islands in July 2007, for which 20 Güralp 6TDs were supplied by SEIS-UK. These seismometers recorded visible refraction first arrivals to offsets of 7.5−10 km. Observed P-wave velocities of 4.4−5.4 km/s lie within the expected range for flood basalts, as do calculated VP/VS ratios of 1.83−1.92. A range in seismic velocities from data picks indicates the presence of structural dip. A preliminary 'best fit' is a two-layer model incorporating our refraction picks and velocities from vertical seismic profiling (VSP) in the Glyvursnes and Vestmanna boreholes, and imposing vertical and horizontal velocity gradients as well as interface depths consistent with a previously published geologic cross-section.