NAPLES, Italy (AFP) — Nearly 2,000 years after wiping out Pompeii, Mount Vesuvius is among the most closely monitored volcanoes in the world, its every shudder recorded.

“Vesuvius is one of the world’s most dangerous volcanos: it is always active, and 600,000 people would be directly at risk if it erupts,” says vulcanologist Claudio Scarpati.

On the flanks of the volcano overlooking the bay of Naples in southern Italy, rising up nearly 1,300 metres (some 4,200 feet), several dozen sensors record seismic activity, the temperature of the gas emitted by the volcano and topographical changes.

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