Fig. 3

Tectonic map of the investigated area redrawn after Scholz and Zacher (1983), Oberhauser (2007), and Pfiffner et al. (2010), showing well locations and traces of seismic sections. Note that the Lower Penninic Feuerstätter nappe and the Liebenstein nappe, the latter representing the Ultrahelvetic unit sensu strictu, are grouped together as “Ultrahelvetic slices/nappes” due to their mélange-like structure. Constructed upper crustal-scale cross sections are labeled 1–4 (N–S cross sections 1–3, E–W cross section 4). Section 5 is a surface profile and sections a and b refer to Fig. 10a, b, respectively. MGI Austria GK West coordinate system