Enzo Boschi told the Corriere della Sera daily that the Marsili volcano has fragile walls that could collapse.
“Our latest research shows ... its walls are fragile and the magma chamber is of sizable dimensions,” Boschi said.
A collapse could result in “a strong tsunami that could strike the coasts of Campania, Calabria and Sicily,” Boschi told the paper.
Marsili rises from the floor of the Tyrrhenian Sea about 90 miles southwest of Naples. It has not erupted during recorded history.