Fig. 10

Model 1: Footwall geometry (S_1/2 and the last deformation phase D4). a Input data on the topography surface (foliation measurements and interface point). b Map view of the modelled footwall foliation field of the S_1/2 fabric on the topographic surface. Each line of different colour highlights the different values of the potential field. Such a representation is used to represent an S_1/2 foliation map. The crosscutting relationships between S_1/2 and the Simplon Line are clear at the NW and SE extremities of the Simplon Line. c–e 3D geometry of the modelled foliation field for S_1/2 represented as one single surface from different viewpoints. B Berisal synform, G Glishorn antiform, SL Simplon Line, S _1/2 Pre-existent regional fabric associated with the D1–D2 deformation phase