Fig. 2

a Bathymetric map (shaded relief, colour indicating depth) of the Chrüztrichter and Vitznau basins of Lake Lucerne. b Interpretation of observed morphology (see text for a detailed description). Mapped features are grouped by colour. Grey basic topography; blue features related to mass movements; red glacial features. Dashed white line across the basins shows location of seismic profile shown in Fig. 9