Yikes - from Phys Org:
Naples astride a rumbling mega-volcano
A slumbering Campi Flegrei volcano under the Italian city of Naples shows signs of "reawakening" and may be nearing a critical pressure point, according to a study published Tuesday.
Italian and French scientists have for the first time identified a threshold beyond which rising magma under the Earth's surface could trigger the release of fluids and gases at a 10-fold increased rate.
This would cause the injection of high-temperature steam into surrounding rocks, said lead author Giovanni Chiodini, a researcher at Italy's National Institute of Geophysics and Volcanology in Bologna.
A bit more:
It is not possible at this time to say when—or if—the volcano will erupt anew, he said.
If it did, however, "it would be very dangerous" for the half-million people living inside and near the caldera, he added, using the scientific name for the bowl-like depression created after a volcano blows its top.
At least they will have plenty of warning - I cannot imagine having to relocate the entire city.
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