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Swiss Journal of Geosciences
Fig. 14 | Swiss Journal of Geosciences

Fig. 14

From: Analysis of tectonic structures and excavation induced fractures in the Opalinus Clay, Mont Terri underground rock laboratory (Switzerland)

Fig. 14

3D simplified block diagram of the Mont Terri anticline and the surrounding structural features. Black arrows indicate the transport direction towards the NNW along the basal décollement plane depicted in red. The Mont Terri anticline is explained by fault-bend folding above a frontal ramp. SW-dipping normal faults are interpreted as being concomitant with lateral extension towards the SW during folding. This is explained by the doming structure plunging towards the SW due to the rhomb-shaped syncline acting like a “lateral ramp”. This is not a true lateral ramp but a combination between frontal and oblique ramps resulting in a “lateral” ramp geometry. The rhomb-shaped basin is bordered by anticlines trending NNE-SSW and NE-SW, formed as non-cylindrical and cylindrical folds, respectively. These structures were interpreted as folding above frontal and oblique ramps, respectively, with an overall transport direction to the NNW. Inherited NNE-striking faults related to the Rhine–Bresse graben system are reactivated in sinistral strike-slip mode

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