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Fig. 2 | Swiss Journal of Geosciences

Fig. 2

From: Influence of rheologically weak layers on fault architecture: insights from analogue models in the context of the Northern Alpine Foreland Basin

Fig. 2

Geology of the Zürcher Weinland (modified after Roche et al., 2020). a Simplified structural map of structures showing fault traces at Top Muschelkalk level according to 3D seismic interpretation. WBFZ: Wildenbuch Fault Zone. Decoupled faults do not cross the Opalinus Clay, coupled faults do (see [c]). Map location shown in Fig. 1b. b Local stratigraphy as revealed in the Benken borehole (location shown in [a]), showing the relative rheological weakness of the Opalinus Clay compared to the units above and below, based on Young’s modulus data from laboratory tests (see Roche et al., 2020 for details). Note that Permo-Carboniferous units were not encountered in this particular borehole. SRD: Seismic Reference Datum (here 500 m above sea level). c Interpreted seismic section A-A’, showing the location of the Opalinus Clay (in grey) and its effect on coupling between the units above and below. For the full names of the seismic horizons, see (b). NHF: Neuhausen Fault Zone, RMF: Rafz-Marthalen Flexure, WBFZ: Wildenbuch Fault Zone

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