GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 1.2 137 Fig. 3 - a) Geological map of the Cervicati-Bisignano area and detailed location of the L1 seismic line; Key map 1: Holocene; 2: Middle-Upper Pleistocene marine terraced deposits; 3: Upper Calabrian sand and conglomerate; 4: Middle Calabrian silty clays; 5: Lower Calabrian sands, sandstones and conglomerates; 6: Gelasian grey-blue clays; 7: Pliocene conglomerates; 8: Miocene sands and calcarenites; 9: Sila unit; 10: Ophiolite bearing units; 11: major east-dipping normal faults: 12: normal faults; 13: other tectonic contacts; 14: Trace of the seimic line L1. b) Line drawing of the main reflectors recognized in the interpreted seismic line L1, with the recognised key reflectors and main normal faults; the low-angle heavy red line is the inferred trace of the CGDF = Crati Graben Detachment Fault; TMF = Torano-Martorano fault; CeF = Cervicati fault; Mev = Messinian evaporites; The Tops of Crystalline basement, Pliocene units, Gelasian deposits and an intra-Calabrian reflection, possibly corresponding to the Emilian-Sicilian boundary. c) Conversion to depth through the Move (tm) software (seismic velocities used for conversion are listed in the table). The PSTZ seems to have significantly influenced the development of the recent “Pollino seismic sequence” possibly acting as a barrier to the southward propagation of the seismogenic ruptures (Brozzetti et al., 2017a). Timing of activity. The timing of activity of the two recognized detachment faults are yet to be accurately constrained. Some scattered outcrop of ancient slope debris involved in the GCL fault zone, suggest for the LCDF an onset not older than Early Pleistocene. An Early-to-Middle Pleistocene age is furthermore attributed, in the literature, to the continental infill of the basins which generated in the hanging wall of the LCDF and of the PSTZ, as the Mercure, Campotenese and Morano Calabro basins (Schiattarella et al., 1994, Schiattarella, 1998; Giaccio et al., 2014).