Debris avalanche deposit from the May 18, 1980 eruption of Mount St...

Debris avalanche deposit from the May 18, 1980 eruption of Mount St...

Detailed Description

The volume of the debris avalanche was nearly 2/3 cubic miles (2.3 cubic kilometers) of debris avalanche that slid from the volcano on May 18, 1980. That is enough material to cover Washington, D.C. to a depth of 14 feet (4 meters). The avalanche traveled approximately 15 miles (24 kilometers) downstream at a velocity exceeding 150 miles per hour (240 km/hr). It left behind a hummocky deposit with an average thickness of 150 feet (45 meters) and a maximum thicknes of 600 feet (180 meters).

Details

Image Dimensions: 3072 x 2048

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