Is Italy's Supervolcano Ready to Erupt Again?

The Campi Flegrei supervolcano near Naples, Italy, is in an "extremely dangerous" state and at a greater risk of eruption than ever, according to a new study. The volcano last erupted in 1538, but since then, tens of thousands of minor earthquakes have weakened the hollow at the summit of the volcano known as the caldera. Local authorities have an established evacuation plan, and risk levels are reviewed monthly. The area of Naples in Italy may be more famous for the volcano Vesuvius, but the Campi Flegrei volcano is a more immediate concern, with 500,000 people living in its red zone - the area of highest risk.