GNGTS 2013 - Atti del 32° Convegno Nazionale

2004; Bonforte et al. , 2011) suggest that contractional processes are still active and cause the growth of another large anticline (the “Catania anticline”) in the north-western outskirts of the town. Fold structures outcropping south of Mt. Etna have also been interpreted as the result of the gravitational spreading of the volcanic edifice of Mt. Etna over the sedimentary substratum (Borgia et al. , 2000; Solaro et al. , 2011). Since the Middle Pleistocene, contractional structures have coexisted with extensional tectonics, as suggested by the occurrence of a NNW-SSE striking oblique (normal-dextral) Fig. 1 – a) Quaternary seismotectonic map of Mt. Etna region and stereographic projections of the principal stress axes (P-axes). Earthquakes recorded during the period 1994-2012 are also reported (http://www.ct.ingv . it/ufs/analisti/catalogolist.php). b) Crustal section with projection of the hypocentral distribution and structural interpretation [Moho depth from Lavecchia et al. , (2007) and references therein]. 49 GNGTS 2013 S essione 1.1