Schiffer, Christian2; Jacobsen, B. H.2; Balling, N.2; Nielsen, S.B.2
1 Department of Geoscience, Science and Technology, Aarhus University2 Department of Geoscience, Science and Technology, Aarhus University
Receiver Functions map crustal architecture
The present-day topography and crustal structure of the East Greenland Caledonides were intensively influenced by several constructive and destructive processes, including the Caledonian orogeny, the subsequent extensional collapse, continental breakup and fluvial and glacial erosional processes. Although erosion driven uplift related to fjord formation is a significant mechanism, the average topographic elevation still exceeds 1 km. This apparent longevity of topography remains matter of discussion. In this context the relationship of topography to crustal thickness and isostatic compensation are of central importance. Furthermore, erosion and possible subcrustal mechanisms have to be considered. Possible shallow structures, related to extensional basin formation, a possible lower crustal high velocity layer and the possible presence of a crustal root attract special attention. A first approach to these issues is the interpretation of Receiver Functions in terms of crustal discontinuities and Moho depth. 11 temporary broadband stations (Ella Ø array) were deployed and maintained by Aarhus University for a period of 2 years (2009 - 2011). The profile is approximately 270 km long and crosses the East Greenland Caledonides from the ice sheet to the coastline at about 73°north. The data are of high quality. Initial Receiver Function results are shown and compared with synthetic data, using velocity models from published wide angle seismic studies in the area.