Fig. 1

Tectonic map of the study area located in central northern Switzerland (modified after Nagra 2014). Black dots indicate the locations of outcrops where the fracture data discussed were collected. Shades of blue indicate the Folded Jura, Deformed Tabular Jura and Tabular Jura tectonic units (see text for discussion). The geological profile illustrates the general structure of the Jura Fold-and-Thrust Belt. Selected regional fault zones mentioned in the text: B Born-Engelberg Anticline, C Chestenberg Thrust, J Jura Main Thrust, L Lägern Anticline, MA Mandach Thrust, ME Mettau Thrust, N Neuhausen Fault, R Randen Fault, S Siglistorf Anticline, W Wölflinswil Graben, WZ Wehra-Zeinigen Fault