That's not a pure Strombolian eruption. Etna does all kind of eruptions, from Hawaiian/htrombolian (effusive eruptions on Etna are the most common) to the feared Plinian eruptions.
Stromboli actually emitted a pyroclastic flow earlier this year. Some tourists were on a boat trip filming the eruption and it suddenly turned into a pyroclastic flow. The tourists were lucky that it didn't travel very far. I didn't know that Stromboli or even Etna emitted pyroclastic flows either but one thing to bear in mind is the fact that they are both in actual fact stratovolcanoes and they're some of the most notorious (alongside calderas) for explosive eruptions of such magnitude.I think over 80% of the world's volcanoes emit pyroclastic flows from time to time.
