[ClearCase_guy]

pyroclastic surges and flows (PDCs)

Acronym FAIL.
They could have explained a density current. Just use the words and tell us it's also known as surges and flows. Why dumb down everything?

[Interesting Times]

Interesting. Evidently extreme heat caused all the fatalities in Pompeii as well as Herculaneum, which is not what was previously believed.

[stboz]

I've visited Pompeii. Vesuvio is NOT really close-by. Pretty creepy when you think about it.

Gives meaning to the phrase "We're toast!"

[Jack Hydrazine]

It was the Doctor who caused Vesuvius to blow!

Fires of Pompeii trailer
http://www.youtube.com/watch?v=7AKjx_amhZw

Part 1
http://www.youtube.com/watch?v=oG2118hhT50&feature=PlayList&p=202F9722BD5AAB0C&playnext_from=PL&playnext=1&index=62

[HospiceNurse]

Lethal Thermal Impact at Periphery of Pyroclastic Surges: Evidences at Pompeii

Of course! The blowdown from the caldera would have obscured the dacite coronal polymorphic schist protruberances. The density current would have been indirectly proportional to the diatreme. The ejecta would have been preceded by fumarolic activity similar to that of the Eocene.

Calling Dr. Obvious.