File:North Fork Toutle River valley in November 1983.jpg
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This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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Summary
| Description | This downstream view of the North Fork Toutle River valley, north and west of St. Helens, shows part of the 0.55 cubic miles (2.3 km3) of debris avalanche that slid from the volcano on May 18. This is enough material to cover Washington, D.C. to a depth of 43 feet (13 m). The avalanche traveled approximately 15 miles (24 km) downstream at a velocity exceeding 150 miles per hour (240 km/h). It left behind a hummocky deposit with an average thickness of 150 feet (45 m) and a maximum thickness of 590 feet (180 m). |
| Date | Taken on 30 November 1983 |
| Source | Archived source link |
| Author | Lyn Topinka, USGS/CVO |
| Permission (Reusing this file) |
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Licensing
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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Textual information (e.g. timestamp) once visible in the image itself has been moved into the image metadata and/or image description page. This makes the image easier to reuse and more language-neutral, and makes the text easier to process and search for. Commons discourages placing visible textual information in images. All licenses accepted on Commons permit this type of modification as a derivative work.
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File history
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 03:42, 5 April 2021 | 2,913 × 1,977 (2.51 MB) | Hike395 | higher resolution |
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