GNGTS 2014 - Atti del 33° Convegno Nazionale

GNGTS 2014 S essione 1.1 45 historical earthquakes (e.g., 1626, Mw=6.1; March 28, 1783, Mw=6.9.) indicating a possible activity of the structure (Galli et al. , 2007). The NE-SW trending fault zones characterize the western margin of Catanzaro Trough, and they are arranged into two antithetic faults. One of these, the Vibo Valentia Fault, (Monaco and Tortorici, 2000; Fig. 3a), is a NW-dipping normal fault which borders the northwestern edge of Serre Massif. In turn, the south-western margin of Sila Massif is bounded by a N35-trending, SE- dipping normal faults where we have collected a significant number of mesostructural data (Fig. 3c). The activity of these faults is documented in both onshore and offshore area. Indeed, close to the shoreline of the S. Eufemia Gulf, Loreto et al. (2013) map the NE-trending S. Eufemia normal fault, which they tentatively suggest as being the seismogenic source of the 1905 Calabrian earthquake. In the light of this, here we propose that the S. Eufemia Fault could continue on-land and stop against the northern tectonic border of the Catanzaro Trough, in the Bagni River valley. In the Capo Suvero area, extending from the southern flank of the Coastal Range, we identified further normal faults showing NW-SE trend; this structures, although poorly visible on mesoscale, border marine terraces and are cut by the NE- trending fault system (Fig. 3d). In recent times, the evolution of the western Catanzaro Trough was also affected by N- S oriented west-facing normal faults, here named Curinga Faults (Fig. 3a). These structures modify the evolution of this sedimentary basin, producing a further western deepening of Catanzaro Trough, this evidence is possibly shown by the presence of Holocene alluvial fans in the western sector, that are missing in the eastern side (Fig. 3a). On the south of the basin, N-S trending faults are more relevant on the mesoscale, being quite common in the Strofolio River valley, where they show a right oblique kinematics. Fig. 3 – a) Structural sketch of the western Catanzaro Trough, i.e. a sub-basin arranged as a graben system; b) WNW- ESE oriented faults with oblique kinematics near the Curinga village; c) west of Lamezia Terme City, there are evidences for recent fault activation along the tectonic contact between Mesozoic Carbonate Complex and Pleistocene Marine Terrace, d) Relationship between NW-SE and NE-SW oriented faults, observed in the Caronte area.