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Geomorphology and event-stratigraphy of recent mass-movement processes in Lake Hallstatt (UNESCO World Heritage Cultural Landscape, Austria)

Authors

Strasser,  Michael
External Organizations;

Berberich,  T.
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Fabbri,  S.
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Hilbe,  M.
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Huang,  J-J. S.
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Lauterbach,  S.
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Ortler,  M.
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Rechschreiter,  H.
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/persons/resource/brau

Brauer,  A.
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Anselmetti,  F.
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Kowarik,  K.
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Citation

Strasser, M., Berberich, T., Fabbri, S., Hilbe, M., Huang, J.-J.-S., Lauterbach, S., Ortler, M., Rechschreiter, H., Brauer, A., Anselmetti, F., Kowarik, K. (2020): Geomorphology and event-stratigraphy of recent mass-movement processes in Lake Hallstatt (UNESCO World Heritage Cultural Landscape, Austria). - In: Georgiopoulou, A., Amy, L. A., Benetti, S., Chaytor, J. D., Clare, M. A., Gamboa, D., Haughton, P. D. W., Moernaut, J., Mountjoy, J. J. (Eds.), Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments, (Geological Society special Publications ; 500), 405-426.
https://doi.org/10.1144/SP500-2019-178


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4924907
Abstract
We report first-ever basin-wide geomorphologic characterization of a high-resolution bathymetry map in a steeply-incised valley-occupying intra-mountainous lake in the Eastern Alps. The resulting new geomorphologic map of Lake Hallstatt is then combined with high-resolution reflection seismic and sedimentary core analyses to document, characterize and date recent (<200 years) subaquatic landslides. The area is located in the UNESCO World Heritage Cultural Landscape of the Hallstatt-Dachstein area, and is well known for its well-documented medieval and prehistoric human settlement history. This allows for calibrating observed mass-movement deposits (MTDs) in the high-resolution sedimentary archive (sedimentation rates ∼0.5 cm/year) of this deep lake dominated by clastic sedimentation. The hydro-acoustic data documents a multitude of different MTDs linked to rock falls, subaqueous slope failures and shore collapses. Sediment cores document laminated background sediments intercalated with distinct event deposits that can be linked to historically-documented major flood events and moderately strong earthquakes. Our study suggests that the larger MTDs result from earthquake-triggered subaquatic delta slope instabilities and that the deeper subsurface provides evidence of even larger mass-movements processes, yet to be validated by longer cores. Thus, Lake Hallstatt is a potential natural laboratory for studying causes and consequences of subaquatic landslides in steeply-incised intra-mountainous lakes and comparable fjord settings.