SCANLIPS3D - SCANdinavian LIthosphere P and S wave experiment 3 D

The SCANLIPS 3D experiment deployed 20 ESP seismometers in northern central Norway and Sweden between June 2013 and September 2014 to investigate the cause of the high topography which dominates Norway and process of topographic uplift. 97% data recovery was achieved. Data quality showed the ESP instruments performed well in comparison to 3T instruments previously deployed in Scandinavia. Over 400 receiver functions were calculated from teleseismic events recorded across the array. Inverse modelling and h-κ stacking of these receiver functions show there is no linear crustal root supporting the present day high topography. A region of thick crust which correlates with a negative residual isostatic gravity anomaly appears to confirm that locally the crust is overcompensated. Comparisons between the surface geology and variations in crustal structure and Moho sharpness suggest that the Caledonian orogeny may have reworked the Proterozoic basement, removing a high velocity lower crustal layer. Background: The SCANLIPS3D experiment builds on existing work conducted in Norway and Sweden (SCANLIPS and SCANLIPS2) to investigate the possible cause of the geologically recent (Miocene) uplift which has affected Scandinavia (Fig. 1). The Scandes mountains show high topography in the south (described by Svenningsen et al. 2007) relatively low topography in central Norway and Sweden (England and Ebbing 2012) and high topography in the North (Ebbing et al. 2012) which it is believed was created by the same regional uplift event. Because of the relatively short wavelength variations in topography, it is suspected that the variations in present day relief are Fig. 1. Topographic map of Scandinavia. SCANLIPS3D stations shown as white squares. Red squares are SCANLIPS stations and SCANLIPS2 stations are shown in green. Thin blue lines are existing refraction profiles. Other symbols are broadband seismic stations deployed as part of the CENMOVE experiment. NERC Geophysical Equipment Facility View more reports on our website at http://gef.nerc.ac.uk/reports.php