Concern is mounting over the risk of an eruption on a sprawling volcanic area close to Naples after the area was struck by the strongest earthquake in 40 years.
Seismic activity on Campi Flegrei, a constellation of ancient volcanic craters, has intensified over the past year and especially in recent months, with more than 80 events occurring in the early hours of Wednesday morning, the biggest being a 4.2 magnitude quake.
