The 26 December 2018 Mw 4.9 earthquake occurred at shallow depth (<1 km) on the eastern flank of Mount Etna and it was the strongest seismic event to hit this volcanic area during the past seventy years. The earthquake caused severe damage up to VIII degree EMS [Quest WG, 2019] and impressive surface faulting effects along the Fiandaca Fault (FF), an important tectonic structure that borders to the south the Timpe tectonic system in the volcano’s eastern flank (Figure 1). The FF runs for about 13 km between Aci Catena to the south and Monte Ilice to the north; the strike of the fault is NNW­SSE in the southern portion and NW­SE in the northern part. The Mw 4.9 earthquake produced surface faulting along a ~8 km­long stretch of the FF. The coseismic ruptures are characterized by dominant...