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Fig. 1 | Swiss Journal of Geosciences

Fig. 1

From: Multi-scale imaging of a slow active fault zone: contribution for improved seismic hazard assessment in the Swiss Alpine foreland

Fig. 1

a Upper frame location of the study area in the western Swiss Molasse basin (MB), south of the Rhine graben (RG). General frame simplified tectonic map. The Interoil zone encircles the region for which interpreted oil industry seismic profiles by (Interoil 2010) are available for this study and in which fault zones interpolated over the base Tertiary horizon are displayed. Dotted lines indicate main synclines; note the marked deviation of the Fribourg Syncline (FS) and the Alterswill culmination (AC-bold lines). The instrumental ECOS (1975–2009) (Fäh et al. 2011) features a prominent NS cluster of earthquakes east of the city Fribourg that ends close to the Mühleberg Nuclear Power Plant (KKM). c NNW–SSE structural cross-section through the western Swiss Molasse basin (Modified from (Matzenauer 2012), profile trace is shown in b). The western Swiss Molasse basin is interpreted as a top-wedge basin (Willett and Schlunegger 2010), where the sedimentary cover is passively transported and deformed on top of a basal detachment in the Triassic evaporites

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