Image:North Fork Toutle River valley in November 1983.jpg
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North_Fork_Toutle_River_valley_in_November_1983.jpg (543 × 353 pixels, taille du fichier : 39 Kio, type MIME : image/jpeg)
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[edit] Description
This downstream view of the North Fork Toutle River valley, north and west of St. Helens, shows part of the nearly 2/3 cubic miles (2.3 cubic kilometers) of debris avalanche that slid from the volcano on May 18. This 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 kilometers/hour). It left behind a hummocky deposit with an average thickness of 150 feet (45 meters) and a maximum thickness of 600 feet (180 meters). (November 30, 1983, by Lyn Topinka, USGS/CVO) USGS image
[edit] Summary
| Description |
North Fork Toutle River valley in November 1983 |
|---|---|
| Source |
http://vulcan.wr.usgs.gov/Volcanoes/MSH/SlideSet/ljt_slideset_old.html |
| Date | |
| Author |
U.S. government |
| Permission (Reusing this image) |
PD |
| Other versions | none |
[edit] Licensing
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This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.
Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. العربية | Български | Česky | Deutsch | English | Español | Français | Magyar | Italiano | 日本語 | 한국어 | Polski | Português | 中文(繁體) | 中文(简体) | +/- |
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| Date et heure | Dimensions | Utilisateur | Commentaire | |
|---|---|---|---|---|
| actuel | 14 mars 2006 à 12:56 | 543×353 (39 Kio) | Reelax | (== Description == This downstream view of the North Fork Toutle River valley, north and west of St. Helens, shows part of the nearly 2/3 cubic miles (2.3 cubic kilometers) of debris avalanche that slid from the volcano on May 18. This is enough material t) |
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