9 votes

Can pyroclastic flows cross water?

Pyroclastic flows can cross water. This doesn't suggest that any pyroclastic deposit can cross water. High energy had needed. For high energy a caldera forming explosion and/or high temperature flow ...
8 votes

Can people on the side of a volcano survive the eruption?

It's always hard to interpret the intentions of an author. But to me, "a rain of hot ash" does not sound like a pyroclastic flow, but rather like a tephra fall, which is a different volcanic ...
5 votes

Are Pompeii and Herculaneum unique?

Probably the best known is more recent, the 1902 eruption of Mt. Pelée on Martinique, where 30,000 people were killed by pyroclastic flows. I don't know the extent of burial - it appears that the city ...
  • 4,349
3 votes

Are Pompeii and Herculaneum unique?

Here is another example: Ceren (El Salvador) around A.D. 660 (discovered in 1978). Ceren is believed to have been home to about 200 people. Researchers have excavated 12 buildings, including living ...
  • 2,636
2 votes

Why are pyroclastic flows ground-bound?

Volcanic plumes and pyroclastic flows are two behaviours of basically the same thing. A volume of hot gasses and tephra (a.k.a. a mix of ash, pumice, and volcanic rocks of different sizes). If the ...
  • 17.2k
1 vote

Pyroclastic density currents interpretation

The name of the cavities are lithophysae. They show that the current has high volatile content. Vapor phase devitrification is the origin of litophysae. Pyroclasts in the curremt maintain their ...

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