Fig. 1
Structural setting of the area struck by the 26 December 2018 Mw 4.9 Mt. Etna earthquake. (a) location map showing the Mt. Etna volcano in the framework of the Apennines-Maghrebian thrust-belt; (b) sketch of the main active fault-systems on Mt. Etna (FF: Fiandaca Fault); (c) detail of the Fiandaca Fault showing the surveyed observation points reported in the present database (green circles), and the focal mechanism of the 26 December earthquake; the main historical earthquakes related to the Fiandaca Fault are reported as pale yellow stars labelled with the year of occurrence. Small labelled circles refer to observation points reported in Fig. 2.
