GEO 210 Lecture Notes - Lecture 19: Old Faithful, Pumice, Supervolcano

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Lava lows and hot projeciles are hazards only in the immediate vicinity of the volcano. Could be impacted by mudlows and clouds of ash (though later could afect very large areas) Pyroclasic low is an avalanche of hot ash, pumice, rock fragments and volcanic gas that lows down a volcano side at about 100 k per hour. Temperature inside may be as high as 500 degrees c. When it stops it may laten and weld together. We have had 2,000 years to ponder this. There have been since that ime about 50 erupions (last 1944 killed 24 people) Only land based super volcano in the world. Yellowstone a caldera of a volcano that is 65 kilometers across. Yellowstone has half the world"s hydrothermal features over. An erupion 2 million years ago covered half of north america with ash swiping out all prehistoric animals. Last erupion was about 640,000 years ago but smaller blasts since then.

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