TY  - JOUR
PY  - 2018//
TI  - A subaqueous hazard map for earthquake-triggered landslides in Lake Zurich, Switzerland
JO  - Natural hazards
A1  - Strupler, M.
A1  - Danciu, L.
A1  - Hilbe, M.
A1  - Kremer, K.
A1  - Anselmetti, F. S.
A1  - Strasser, M.
A1  - Wiemer, S.
SP  - 51
EP  - 78
VL  - 90
IS  - 1
N2  - 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.<p />  <p>Language: en</p>
LA  - en
SN  - 0921-030X
UR  - http://dx.doi.org/10.1007/s11069-017-3032-y
ID  - ref1
ER  -