What are pyroclastic flows?

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Offline thedoc

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What are pyroclastic flows?
« on: 06/07/2010 18:00:27 »
What exactly are pyroclastic flows and what makes them so deadly?  
Asked by Nsbuk001, Twitter


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« Last Edit: 06/07/2010 18:00:45 by BenV »

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Offline thedoc

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Re: What are pyroclastic flows?
« Reply #1 on: 06/07/2010 18:00:27 »
We posed this question to Hazel Rymer from the Open University...

Hazel -   Pyroclastic means literally broken by fire.  It means broken up and exploded rocks.  So when a volcano explodes, it forms a pyroclastic flow and whatís so nasty about it is that they are often very, very hot, and they are clouds of very hot ash that go bellowing very, very rapidly along the ground, engulfing everything in their path. If you've ever been to Pompeii or Herculaneum, and seen the devastation, thatís why they're so dangerous.
« Last Edit: 06/07/2010 18:00:51 by BenV »

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Offline imatfaal

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What are pyroclastic flows?
« Reply #2 on: 07/07/2010 13:51:30 »
http://www.metacafe.com/watch/119241/big_in_japan/ 

I cannot find one on google video search that has good reference points to show the immense speed over the ground, but the reaction of the man in white and the fire engine crew is pretty demonstrative.

 
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