geo.wikisort.org - Mountains

Mount Sanford is a shield volcano[3] in the Wrangell Volcanic Field, in eastern Alaska near the Copper River. It is the sixth highest mountain in the United States and the third highest volcano behind Mount Bona and Mount Blackburn. The south face of the volcano, at the head of the Sanford Glacier, rises 8,000 feet (2,400 m) in 1 mile (1,600 m) resulting in one of the steepest gradients in North America.

Mount Sanford
Mount Sanford (left) and Mount Wrangell in 1980
Highest point
Elevation	16,237 ft (4,949 m)[1] NAVD88
Prominence	7,687 ft (2,343 m)[1]
Isolation	40.3 mi (64.8 km)[1]
Listing	North America highest peaks 13th North America prominent peak 50th US highest major peaks 6th Alaska highest major peaks 6th
Coordinates	62°12′50″N 144°07′44″W[2]
Geography
Mount Sanford Alaska
Location	Wrangell-St. Elias National Park and Preserve, Alaska, U.S.
Parent range	Wrangell Mountains
Topo map	USGS Gulkana A-1
Geology
Mountain type	Shield volcano[3]
Last eruption	320,000 years ago
Climbing
First ascent	July 21, 1938 by Terris Moore and Bradford Washburn[4]
Easiest route	Sheep Glacier (North Ramp) Route, Alaska Grade 2[4]

Geology

Mount Sanford is mainly composed of andesite, and is an ancient peak, being mostly Pleistocene, although some of the upper parts of the mountain may be Holocene. The mountain first began developing 900,000 years ago, when it began growing on top of three smaller shield volcanoes that had coalesced. Although obscured by icefields, the uppermost 2,000 feet (610 m) of the mountain appear to be a lava dome filling a larger summit crater.[5]

Two notable events in the mountain's history include a large rhyolite flow which traveled some 11 miles (18 km) to the north east of the peak and has a volume of about 5 cubic miles (21 km³), and another flow which erupted from a rift zone on the flank of the volcano some 320,000 years ago. The second flow was basaltic in nature and marks the most recent activity of the volcano. The flow was dated using radiometric methods.[3]

Observers have reported minor activity at Sanford, primarily vapor clouds or plumes from ice and rockfalls. Some reported incidents may have been orographic clouds, while others have been interpreted as avalanches.[6]

The majority of Mount Sanford above 8,000 feet (2,400 m) is covered by icefields, merging to the south with that surrounding Mount Wrangell. The largest glacier on Sanford is the Sanford Glacier, whose source lies at the steep cirque that cuts into the south side of the mountain.[5]

History

The mountain was named in 1885 by Lieutenant Henry T. Allen of the U.S. Army, a descendant of Reuben Sanford (an American politician).[2]

Mount Sanford was first climbed on July 21, 1938 by noted mountaineers Terris Moore and Bradford Washburn, via the still-standard North Ramp route up the Sheep Glacier. This route "offers little technical difficulty" and "is a glacier hike all the way to the summit"[4] but is still a serious mountaineering challenge (Alaska Grade 2) due to the altitude and latitude of the peak. The base of the route is usually accessed by air, but landing near the mountain is not straightforward.

On March 12, 1948, Northwest Airlines Flight 4422 crashed into Mount Sanford. All 24 passengers and 6 crew members were killed. The wreckage was quickly covered by snow and was not found again until 1999.[7]

The first solo ascent of Mount Sanford was achieved on September 19, 1968, by Japanese mountaineer Naomi Uemura, who later died just after making the first solo winter ascent of Denali.[8]

See also

• List of mountain peaks of North America
  • List of mountain peaks of the United States
    • List of mountain peaks of Alaska
• List of the highest major summits of the United States
• List of the most prominent summits of the United States
• List of the most isolated major summits of the United States
• List of volcanoes in the United States

References

Sources

• Richter, Donald H.; Rosenkrans, Danny S.; Steigerwald, Margaret J. (1995). Guide to the Volcanoes of the Western Wrangell Mountains, Alaska (PDF). USGS Bulletin 2072.
• Richter, Donald H.; Preller, Cindi C.; Labay, Keith A.; Shew, Nora B. (2006). Geologic Map of the Wrangell-Saint Elias National Park and Preserve, Alaska. USGS Scientific Investigations Map 2877.
• Winkler, Gary R. (2000). A Geologic Guide to Wrangell—Saint Elias National Park and Preserve, Alaska: A Tectonic Collage of Northbound Terranes. USGS Professional Paper 1616. ISBN 0-607-92676-7.
• Wood, Charles A.; Kienle, Jürgen, eds. (1990). Volcanoes of North America. Cambridge University Press. ISBN 0-521-43811-X.

External links

• Mount Sanford at the Alaska Volcano Observatory
• "Sanford Trip Report". Mt. Sanford Expedition via the Sheep Glacier, 2014. Retrieved 2014-08-14.

На других языках

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[de] Mount Sanford

Mount Sanford ist ein Schildvulkan in den Wrangell Mountains in Alaska. Mit 4949 m ist er der zweithöchste Gipfel der Bergkette und der dritthöchste Vulkan in den Vereinigten Staaten. Nach Süden hat der Vulkan mit einem Gefälle von 2400 m auf einer Strecke von 1,6 km einen der steilsten Abhänge Nordamerikas.[1]

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- [en] Mount Sanford (Alaska)

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[fr] Mont Sanford

Le mont Sanford est un volcan des montagnes Wrangell situé en Alaska, aux États-Unis[2].

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[it] Monte Sanford

Il monte Sanford è un vulcano degli Stati Uniti d'America, situato nello Stato dell'Alaska. Si trova all'interno del Wrangell-St. Elias National Park and Preserve, e con i suoi 4.949 m s.l.m. rappresenta la seconda vetta più elevata della catena montuosa dei monti Wrangell.[1].

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[ru] Санфорд (вулкан)

Санфорд (англ. Mount Sanford) — щитовидный вулкан высотой 4949 метров[4], расположенный на востоке Аляски рядом с рекой Коппер. Это третий по высоте вулкан США после вулканов Бона и Блэкберн. Южный склон вулкана возвышается на 2400 метров на участке протяженностью 1600 метров, что делает этот склон одним из самых крутых в Северной Америке.

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