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

Strupler, M.; Danciu, L.; Hilbe, Michael; Kremer, K.; Anselmetti, Flavio; Strasser, M.; Wiemer, Stefan (2018). A subaqueous hazard map for earthquake-triggered landslides in Lake Zurich, Switzerland. Natural Hazards, 90(1), pp. 51-78. Springer 10.1007/s11069-017-3032-y

[img] Text
StruplerNatHaz.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (5MB) | Request a copy

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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Hilbe, Michael; Anselmetti, Flavio and Wiemer, Stefan

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0921-030X

Publisher:

Springer

Language:

English

Submitter:

Flavio Anselmetti

Date Deposited:

09 Nov 2017 17:54

Last Modified:

08 Mar 2018 15:38

Publisher DOI:

10.1007/s11069-017-3032-y

BORIS DOI:

10.7892/boris.105301

URI:

https://boris.unibe.ch/id/eprint/105301

Actions (login required)

Edit item Edit item
Provide Feedback