A slumbering Campi Flegrei volcano under the Italian city of Naples shows signs of “reawakening” and may be nearing a critical pressure point. 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.
http://phys.org/news/2016-12-naples-astride-rumbling-mega-volcano.html#jCp
