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Title: This Is A Pyroclastic Flow View count: 11145 Rating: 4.647059 (17 ratings) Description: This is a pyroclastic flow and how it forms. A pyroclastic flow is a giant avalanche of volcanic ashes and gas that sometimes will sprout from an eruption column when the upward thrust is destabilized [in the Montserrat case], from the side of a volcanic mountain that has recently collapsed [in the Mount Saint Helens case] or sometimes directly from the magma chamber itself [in the Krakatoa case] This horizontal avalanche consists of sulphur dioxide, carbon dioxide, carbon monoxide, volcanic ash and lava boulders. It moves at up to 700 kilometers per hour, has a temperature of ~1000 degrees Celsius, and can travel up to 200 km from it's source. If it hits a large mass of water, it will not die down, but turn into a pyroclastic surge. Pyroclastic surges are similar to flows, but are less dense and usually always travel at the speed maximum. They usually only travel ten kilometers from their source, but when they hit water they create a pocket of steam underneath which maintains momentum, making it self-propelling. The Krakatoa pyroclastic surge travelled 80 kilometers until it dissipated. The fantastic song featured; Omen, by The Prodigy. Footage from Montserrat [the parts that are clearly real] from dsc.discovery.com. Special FX footage of Mount Saint Helens [ the parts that are obviously fake ] from Seismic Seconds. Tags: the prodigy, Author: MusicBasterd |
