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Yellowstone Caldera and Mount St. Helens | by Image Editor
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Yellowstone Caldera and Mount St. Helens

Left:

The Yellowstone River flowing through Hayden Valley in the northeastern part of the Yellowstone Caldera, Yellowstone National Park, Wyoming, USA. The caldera rim can be seen in the distance.

 

Right:

A magnitude 5.1 earthquake at 8:32 a.m. PDT on May 18, 1980 caused the entire weakened north face of Mount St. Helens to slide away, suddenly exposing the partly molten, gas- and steam-rich rock in the volcano to lower pressure and triggering a major pumice and ash eruption.

 

Credits:

Yellowstone Caldera: Ed Austin and Herb Jone, National Park Service

 

Mount St. Helens: Austin Post, USGS

 

Used in the article "" on ---.

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Taken on January 5, 2009