formed by an eruption of the Campi Flegrei super volcano more than two million years ago. The caldera stretches 125 miles under the Bay of Naples to the city’s western limits, and out to the ...

The seismic activity is occurring across a vast caldera, formed by an eruption of the Campi Flegrei super volcano more than two million years ago. The caldera stretches 125 miles under the Bay of ...