Etna 10 Oct 2016 had an explosion and a crater collapse
November 2, 2016
“Bocca Nuova crater floor collapses
Etna mountain guide Marco Ponte reported that “the whole” of the Bocca Nuova crater has collapsed (subsided) by 50-70 meters since yesterday’s explosion.
Volcanic tremor is showing a weak, but increasing trend, suggesting that something is happening at the volcano and could result in surface activity in a near future. What is coming next at Etna is currently pure speculation.”