A subaqueous hazard map for earthquake-triggered landslides in Lake Zurich, Switzerland

M. Strupler (), L. Danciu, M. Hilbe, K. Kremer, F. S. Anselmetti, M. Strasser and S. Wiemer
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M. Strupler: Geological Institute, ETH Zurich
L. Danciu: ETH Zurich
M. Hilbe: University of Bern
K. Kremer: ETH Zurich
F. S. Anselmetti: University of Bern
M. Strasser: Geological Institute, ETH Zurich
S. Wiemer: ETH Zurich

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2018, vol. 90, issue 1, No 3, 78 pages

Abstract: Abstract The awareness of geohazards in the subaqueous environment has steadily increased in the past years and there is an increased need to assess these hazards in a quantitative sense. Prime examples are subaqueous landslides, which can be triggered by a number of processes including earthquakes or human activities, and which may impact offshore and onshore infrastructure and communities. In the literature, a plenitude of subaqueous landslide events are related to historical earthquakes, including cases from lakes in Switzerland. Here, we present an approach for a basin-wide earthquake-triggered subaquatic landslide hazard assessment for Lake Zurich, which is surrounded by a densely populated shoreline. Our analysis is based on high-resolution sediment-mechanical and geophysical input data. Slope stabilities are calculated with a grid-based limit equilibrium model on an infinite slope, which uses Monte Carlo sampled input data from a sediment-mechanical stratigraphy of the lateral slopes. Combined with probabilistic ground-shaking forecasts from a recent national seismic hazard analysis, subaquatic earthquake-triggered landslide hazard maps are constructed for different mean return periods, ranging from 475 to 9975 years. Our results provide a first quantitative landslide hazard estimation for the lateral slopes in Lake Zurich. Furthermore, a back-analysis of a case-study site indicates that pseudostatic accelerations in the range between 0.04 and 0.08 g were needed to trigger a well-investigated subaqueous landslide, dated to ~2210 cal. years B.P.

Keywords: Subaquatic hazard; Spatial seismic slope-stability assessment; Lake Zurich; Subaqueous geomorphology; Paleoseismology (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1007/s11069-017-3032-y

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