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Eruption of AD 79

In AD 79, Vesuvius erupted in one of the most catastrophic eruptions of all time. Historians have learned about the eruption from the eyewitness account of Pliny the Younger, a Roman administrator and poet. Several dates are given in the surviving copies of the letters. The latest evidence supports earlier findings and indicates that the eruption occurred after 17 October.

The volcano ejected a cloud of stones, ashes and volcanic gases to a height of 33 km (21 mi), spewing molten rock and pulverized pumice at the rate of 6 × 10 cubic metres (7.8 × 10 cu yd) per second, ultimately releasing 100,000 times the thermal energy released by the Hiroshima-Nagasaki bombings. The cities of Pompeii and Herculaneum were destroyed by pyroclastic surges and the ruins buried under tens of metres of tephra.