Volcanic Cloud
A volcanic cloud , kind of casting pyroclastic , is a phenomenon of Avalanche made up of a mixture of Gaz burning and incandescent Lave surrounded by a cloud of dust, running along the sides of a Volcan and channeling themselves in the valleys. One distinguishes sometimes pyroclastic casting from the volcanic cloud according to the solid presence of material (Pumice and Lave solidified in particular) in the avalanche.
These clouds can reach the speeds ranging between 50 and 300 kilometers/hour and move at very long distances, about several kilometers. Their Température varies from 500 to 1200 °C. These two parameters make of them phenomena devastators, difficult to anticipate and against which there does not exist effective physical protection. The volcanic clouds are able to surprise even the best specialists: in June 1991, one of them, descending the Mount Unzen with the Japan, killed celebrates it couple of photographers volcanologist S French Maurice and Katia Kraft.
A volcanic cloud resulting from the Peeled Mountain in Martinique the morning of May 8th 1902, destroyed in a few seconds Saint-Pierre and made 28 000 with 30 000 dead. This term, used inter alia by Alfred Lacroix come to on the spot study the phenomenon after this catastrophe, passed in the usual vocabulary (it was then used to describe the explosion of the Holy Mont Helens or the eruption of the Pinatubo in Philippines) and was even adopted in the jargon of the Anglo-Saxon volcanologists , without the accents ( volcanic cloud ).
One also allots the destruction of Pompei and Herculanum, in the Roman antiquity, with a volcanic cloud.
External bonds and vidéos
A short film of Maurice and Katia Kraft, on the ''' volcanic clouds '''.
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