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Theis Sejer Andersen, University of Aarhus (Denmark)
Flemming Jorgensen, GEUS - Geological Survey of Denmark and Greenland (Denmark)
Steen Christensen, University of Aarhus (Denmark)
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Buried tunnel valleys are found throughout the Northern part of Europe which was covered by ice sheets during the Pleistocene. Offshore, along the North Sea coast of Denmark, a large amount of such valleys has been interpreted and mapped using seismic reflection surveys. Onshore, the Buried Quaternary Valleys are typically mapped by use of dense electromagnetic soundings and to a lesser extent by seismic surveys. The buried offshore and onshore valleys all show a complicated pattern with respect to generations, orientation, and infill, but a comparison and correlation of the onshore and offshore valleys have until now not been done due to lack of sufficient data. We will in the presentation show examples of onshore and offshore buried tunnel valleys that can be interconnected across the North Sea coast of Denmark, and we will compare the valleys in regard to their structural and spatial outlines. The following topics will be presented. 1) Mapping methods used and the benefits of these. 2) A correlation and comparison of the offshore and onshore buried tunnel valleys along a part of the Danish North Sea coast. 3) A geological model presented in 3D with focus on the infill, orientations, and the generations of the valleys.
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