This supersized volcano formed around 40,000 years ago, producing an eruption that unleashed 500 cubic kilometers (120 cubic miles) of volcanic debris in mere moments. Some of it was found as far afield as Greenland.
The blast registered as a 6 or 7 on the Volcanic Explosivity Index (VEI) – the most powerful type of eruption. It was, without a doubt, the most powerful volcanic eruption in Europe in the last 200,000 years.
It’s erupted infrequently since then, and scientists are concerned that it may one day cause another VEI 6 event. Vesuvius, the infamous volcano nearby, will look like a firecracker in comparison.
Considering that millions of people live literally within the crater, let alone the millions more living just outside the rim, this make it one of the most dangerous – and heavily monitored – volcanoes in the world.
That’s why, when it was discovered that the ground had risen 0.38 meters (1.25 feet) since 2005, it caused a fair bit of concern. Between 1982 and 1984, the ground moved upwards by 1.8 meters (5.9 feet), about 24 times as fast as the current rate of ascension. Nothing happened, of course, but volcanologists were getting ready to sound the alarm.
Nearby Vesuvius has got nothing on Campi Flegrei. S-F/Shutterstock
There is a huge debate as to why the ground rose, with some thinking that it was, and is, magma infilling into a cavity and causing pressure on the roof. Other studies suggest highly pressurized fluids are butting up against the roof, which although not ideal is better than an accumulation of fresh, eruptible magma.
This new study, published in Nature Communications, appears to buy into the second hypothesis to some degree. So although this unrest is worrying, as any around a volcano would be, there’s absolutely no sign that these fields of fire are about to erupt just yet.
Then again, it is 2016.