Warning over Italy's Campi Flegrei comes after experts said Long Valley Caldera in California could erupt The Italian government is planning for a possible evacuation of more than 300,000 people due to a nearby dormant super volcano showing signs of an eruption - one month after American researchers found one rumbling in the US.
Campo Flegrei, west of Naples, has experienced more than 2,500 earthquakes in the past three months, with the largest hitting a 4.0 magnitude, which is a similar scenario that led to its 1583 eruption.
Scientists have predicted that if this sleeping giant blows, it could create a plum large enough to plunge Earth into a global winter for years.
The warning comes months after California researchers detected more than 2,000 earthquakes rumbling through the state's Long Valley Caldera that they said 'are precursors of an eruption.'