When Is Mud Dangerous?
ES1204  Glacial Outburst Mudflow

USGS
Debris flow started as a glacial outburst flood from water stored at the base of or inside a glacier.

Mount Rainier hasn't erupted in more than one hundred years, yet ash-laden mudflows can still run down it today.

This one, caught in action, was initiated by the sudden release of water stored at the base of a glacier. Outburst floods become debris flows by picking up large quantities of ash and loose debris as they move.

5. List at least two factors that contribute to the formation of mudflows on volcanoes.


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