Fig. 2

Map showing the bedrock topography of the Bern area with 10 m-contour lines. The map was reproduced using the openly accessible digital dataset for the bedrock topography of the canton Bern (https://www.geo.apps.be.ch/de/;Karten;Felsrelief), and it is also available from the openly accessible database of swisstopo (© swisstopo). This dataset was originally produced by Reber and Schlunegger (2016). The map also displays the drillings that reached the bedrock (red dots). Most of the drillings, however, did not reach the bedrock and yield minimum constraints on the depths of the overdeepening contour lines (green dots). The blue dots illustrate the location of the gravity stations that are used in this study. The map also shows the profiles (in yellow) that were analyzed for the measured gravity signals (see legend of Fig. 1 for labels). Modified after Bandou et al. (2022)