Pyroclastic flow from the Aug. 7, 1980 eruption stretches from Moun...

Pyroclastic flow from the August 7, 1980 eruption stretches from Mo...

Detailed Description

During the May 18, 1980 eruption, at least 17 separate pyroclastic flows descended the flanks of Mount St. Helens. Pyroclastic flows typically move at speeds of over 60 miles per hour (100 kilometers/hour) and reach temperatures of over 800 Degrees Fahrenheit (400 degrees Celsius).


Image Dimensions: 1951 x 2873

Date Taken:

Location Taken: US