Fig. 4

Tectonic map of the study area (Bundesamt für Wasser und Geologie 2005) with the focal mechanisms (lower-hemisphere equal-area projections) of the events listed in Table 1; the nodal planes which could be identified as the active fault planes are marked in red. The oblique line is the trace of the cross-section in Fig. 2. The small polygon delineates the eastern part of the Helvetic domain discussed in the text, corresponding to the stress-inversion results marked “E-part of Helvetic” in Fig. 6