Fail:North Fork Toutle River valley in November 1983.jpg

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Ringkasan

Keterangan 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).
Tarikh Taken on 30 November 1983
Sumber Archived source link
Pengarang Lyn Topinka, USGS/CVO
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Perlesenan

Public domain
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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30 November 1983

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Tarikh/WaktuGambar kenitUkuranPenggunaKomen
semasa10:42, 5 April 2021Gambar kenit bagi versi pada 10:42, 5 April 20212,913 × 1,977 (2.51 MB)Hike395higher resolution
04:49, 26 November 2010Gambar kenit bagi versi pada 04:49, 26 November 2010543 × 319 (104 KB)Aavindraause original files' color
04:16, 15 Julai 2008Gambar kenit bagi versi pada 04:16, 15 Julai 2008543 × 319 (32 KB)Jarekt{{Information |Description=Cropped watermark |Source= |Date= |Author= |Permission= |other_versions= }}
10:56, 14 Mac 2006Gambar kenit bagi versi pada 10:56, 14 Mac 2006543 × 353 (39 KB)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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