Soft-sediment deformation of Late Pleistocene sediments along the southwestern coast of the Baltic Sea (NE Germany) |
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Authors: | G?sta Hoffmann and Klaus Reicherter |
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Affiliation: | (1) Department of Applied Geoscience, German University of Technology in Oman, PO Box 1816, Athaibah PC 130, Muscat, Sultanate of Oman;(2) Lehr- und Forschungsgebiet Neotektonik und Georisiken, RWTH Aachen University, Lochnerstr. 4-20, 52056 Aachen, Germany |
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Abstract: | A 1,460-m-long profile of a Late Glacial subglacial, glacio-fluvial, glacio-limnic and glacio-deltaic sequence exposed at a cliff section on Usedom Island (SW Baltic Sea coast) is described. The sequence is up to 31 m thick and shows sedimentary structures typical of a glacial setting. Soft-sediment deformation is encountered and is associated with changes in lithology. These deformations include liquefaction, slumping, and faulting. As the most plausible cause, earthquake-induced shaking is discussed. The associated neotectonic activity is seen as a consequence of the postglacial isostatic crustal rebound. As the deglaciation earthquake ratio diminishes with time and as the rebound is phasing out, no large earthquakes are anticipated for northern Germany, although in conclusion the lithosphere of the North German Basin has to be regarded as weakened by repeated ice loading and deloading. |
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