Answer: Italy
Notes: The strongest earthquake in decades recently hit Italy’s Campi Flegrei supervolcano region. Campi Flegrei, located near Naples, is an active volcanic system with multiple centers in a 12-15 km caldera formed 39,000 years ago. Unlike Mount Vesuvius, it is more active and expansive, with a third under the Tyrrhenian Sea. The last eruption in 1538 created Monte Nuovo. Restless since 1950, it poses significant geological risks.
