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VOLCANIC HAZARDS (ASH AND TEPHRA (these form when magma is GRAGMENTED by…
VOLCANIC HAZARDS
ASH AND TEPHRA
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the finest ash can be carried HIGH into the atmosphere and is carried by PREVAILING winds over large areas
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PYROCLASTIC FLOW
lethal MIXTURE of superheated gases, hot ash and rock fragments
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LAHARS
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1985 - nevado del ruiz eruption resulting in a lahar flowing at 100km an hour with 20,000 people dying as they were buried by hot mud
LAVA
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however, it can DESTROY everything in its path such as property and infrastructure
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VOLCANIC GASES
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1996 - Lake Nyos - over 1700 people died of CO2 poisoning as a heavier than AIR cloud rich in CO2 was expelled from a volcanic lake. people 23km away died in their sleep
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