Fig. 9

Block diagram schematically showing the distribution of deformation in conglomeratic sediments above a fault corridor cross-cutting the Mesozoic limestones. The deformation is characterized by a strain gradient, with a higher density of discontinuous fractures and strained pebbles in the centre (1), decreasing laterally by ~150 m to unstrained domains (4). In the central part, pebbles are fractured and offset (1), while the size of fractures decreases rapidly (non-offset pebbles are found at several tens of meters across (2), and at the margin of the deformation zone, pebbles only show some joints and striae. Note that The fault corridor is larger and more accentuated in the Mesozoic basement, due to its initial pre-Pliocene age. Scattered and heterogeneous deformation that is expressed in the Pliocene molasse-type sediments above the fault suggests continuation of deformation after the Pliocene, but with less intensity and only minor offset