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Date/Time Thumbnail Dimensions User Comment; current: 01:53, 7 December 2007: 884 × 569 (104 KB): Murraybuckley {{Information |Description=svg map of the 1980 mount st helens ash fallout, info from usgs map |Source=self-made |Date=6 dec 2007 |Author= Murraybuckley |Permission= all rights released |other_versions= png version [[Image:1980_St._
The ash cloud produced by the eruption, as seen from the village of Toledo, Washington, 35 mi (56 km) to the northwest of Mount St. Helens: The cloud was roughly 40 mi (64 km) wide and 15 mi (24 km; 79,000 ft) high. Ash cloud from Mt. St. Helens as captured by the GOES 3 weather satellite at 15:45 UTC.
Mount St. Helens erupts on May 18, 1980. Although the largest volcanoes like Mount St. Helens get the most attention, the Cascade Volcanic Arc includes a band of thousands of very small, short-lived volcanoes that have built a platform of lava and volcanic debris. Rising above this volcanic platform are a few strikingly large volcanoes that ...
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Mount St. Helens, once the fifth-tallest peak in Washington State, lost about 1,300 feet from its height of 9,677, according to the USGS. The highest part of the crater rim on the southwestern ...
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By comparison, the eruption of Mount St. Helens on May 18, 1980, was 0.25 cubic miles (1.0 km 3) in volume. [7] By contrast, the most powerful human-made explosive device ever detonated, the Tsar Bomba , had a yield of 50 megatons, whereas the eruption at La Garita was about 5,000 times more energetic.
Per the Forest Service, the Mount St. Helens National Volcanic Monument is a 110,000-acre designation within the Gifford Pinchot National Forest. It was established in 1982 for the purposes of ...