Depth imaging of basalt flows in the Faeroe-Shetland Basin

Details Depth imaging of basalt flows in the Faeroe-Shetland Basin Depth imaging of basalt flows in the Faeroe-Shetland Basin

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.152..353f&link_type=abstract

Geophysical Journal International, Volume 152, Issue 2, pp. 353-371.

Astronomy and Astrophysics

Astronomy

9

Faeroe-Shetland Basin, Long-Offset Seismic, Rifting, Subbasalt Imaging, Synthetic Aperture Profiling

Scientific paper

We use a grid of long-offset seismic profiles to map the thickness of subsurface basalt flows that extend southeastward across the Faeroe Shelf. Offsets of up to 38000 m were achieved using two seismic acquisition vessels towing multichannel streamers and shooting alternately. Wide-angle reflections and refractions from the basalt and underlying strata allow us to build a velocity model down to the basement Lewisian crust. The velocity models give a first-order picture of the geology of low-velocity sediments of presumed early Palaeocene and Mesozoic age beneath the basalt flows. They also provide a control for pre-stack depth migration of the entire seismic data set, thus allowing us to produce good depth images of the structure. Pre-stack depth migration of selected wide-angle arrivals, such as those from the base of the basalt and the underlying basement, produce strong reflection images that allow these interfaces to be identified unambiguously on the higher-resolution images produced from the entire data set: in particular, we can distinguish between the primary and multiple reflections. We thus use the very long-offset arrivals to `tag' the velocities of the geological interfaces from which they are returned, and hence to improve both the imaging and the interpretation of the basalt flows and the underlying structure.

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