File:Mt. St. Helens (Cascade Range, Washington State, USA).jpg
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Summary[edit]
DescriptionMt. St. Helens (Cascade Range, Washington State, USA).jpg |
Mt. St. Helens (looking ~ESE) (photo stitch by Mary Ellen St. John) Mt. St. Helens is the most active volcano in the Cascade Range, a series of subduction zone stratovolcanoes in a ~north-south line from northern California to Oregon to Washington State to southwestern British Columbia. St. Helens is a 40,000 to 50,000 year old, andesitic-dacitic-basaltic volcano that typically has explosive ash eruptions (as do all subduction zone stratovolcanoes). The 1980 eruption was a northward-directed lateral blast that followed an enormous landslide of the northern face of the volcano. The landslide was triggered by a moderate earthquake at 8:32 AM, Sunday, 18 May 1980. Snow and ice on the mountain melted during the eruption, mixed with ash and other debris, and rushed down nearby river valleys as lahars (volcanic mud flows). The ash, lapilli, and pumice erupted from Mt. St. Helens in May 1980 was dacite, an intermediate extrusive igneous rock. Most of the air-fall dacite ash fell in Washington State, Oregon, and Idaho, but a minor amount accumulated as far east as Minnesota and Oklahoma. Light dustings of ash were also observed in Ohio. The 1980 eruption was the largest in recent American history. The volcano was intermittently active until 1986. Minor activity occurred from 1989 to 1991 and from 2004 to 2006. The area is now a park ("national volcanic monument") and is accessible to tourists. This summer 2012 photo is looking up the Toutle River Valley toward the northwestern face of the volcano. The top third of the mountain was blown away during the 1980 eruption. Much of the landscape is still nonvegetated and covered with gray volcanic tephra. Location: Mt. St. Helens, northwestern Skamania County, Cascade Range, southwestern Washington State, USA (46˚ 12’ 04” North, 122˚ 11” 18” West) |
Date | |
Source | Mt. St. Helens (Cascade Range, Washington State, USA) |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30854492951. It was reviewed on 13 November 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 November 2016
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current | 05:21, 13 November 2016 | 4,361 × 1,917 (4.16 MB) | Kingofthedead (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Width | 4,361 px |
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Height | 1,917 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 200 dpi |
Vertical resolution | 200 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 16:25, 12 November 2016 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | uuid:ECC56C6AD89EE611BFE8C61F40D1E88A |
Date and time of digitizing | 11:41, 30 October 2016 |
Date metadata was last modified | 09:25, 12 November 2016 |
Copyright status | Copyright status not set |
IIM version | 37,608 |
- Mount St. Helens in 2016
- November 2016 in Washington (state)
- Earthquake-triggered landslides in the United States
- Volcanic landslides
- Mount St. Helens 1982 eruptions
- Tephra in Washington (state)
- Tephra in the United States
- Landslides in Washington (state)
- Photographs of volcanoes from James St. John's Flickr stream