Abstract
Summary GPR is used to investigate a tsunamigenic sand layer within peat deposits on the Shetland islands. The tsunami sand is associated with the Storegga slide that occurred off the coast of Norway around 8,150 cal yr BP. The ground-penetrating radar (GPR) used in this study includes 100, 200 and 500 MHz antennas. The 100 and 200 MHz image the sand layer as well as underlying peat and glacial deposits while the 500 MHz antennas image the sand layer but not the underlying layers along most of the GPR profile. Interpretation of the GPR profile indicates localised erosion of the tsunami sand layer and multiple hypotheses for this erosion including anthropogenic activity, stream erosion, tsunami erosion and peat slumping are considered. In addition, we discuss the potential threat to infrastructure should such an event occur on the Shetland Islands today.
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