There are some main faults,which are just crossing Mt. Etna with Vulcano and Vulcano with Stromboli. If yes, does it concern Mt. Roman Krska Roman, The general accept explanation for volcanism at Mt. Etna, Vulcano, and Stromboli is the subduction of part of the northward-moving African Plate beneath the Eurasian Plate. Subduction may be in a late stage of evolution or may have ceased. The faults you noted may have influenced the location of the volcanoes but probably do not influence the source of the magma.
Mt. Etna is unusual because it is adjacent to but just outside of the subduction zone.
It has been suggested that material associated with the subduction zone migrates into the lithosphere adjacent to the Aeolian arc. Lava from Etna shares a few chemical similarities to hot spot volcanoes. However, these may result from modification at the source or during ascent of the magma.