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Vol Lecture Notes 2

Sakura jima japan vulcanian explosions vulcanian

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Unformatted text preview: Vulcanian Explosions are thought to occur when debris blocks a vent a gas exsolved from the magma builds up beneath the blockage. When the strength of the block is exceeded, it is ejected. Consequent drop in pressure on the magma results in further exsolution and expanding gas propels magma out of the vent. 7 Pyroclastic flow generated by Vulcanian explosion of Mt. Ngauruhoe, New Zealand, 1974. Plinian Style Eruptions Plinian Eruptions are the largest and most energetic eruptions, producing clouds of ash that reach the stratosphere Used for large range of eruptions. Therefore, sometimes broken down into subplinian(<0.1 km3) plinian ultraplinian (>10 km3) Typically produce both large ash falls and pyroclastic flows 1944 Plinian Eruption of Vesuvius 8 Vesuvius Above Pompeii Named for the description given by Pliny the Younger of the 79 AD eruption of Vesuvius Plinian Explosions Plinian explosions occur when bubbles of exsolving magmatic gas completely disrupt the magma i.e., a transformation from a bubbly liquid to a gas contai...
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