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| Mount Mageik | |
|---|---|
| Name | Mount Mageik |
| Elevation m | 2036 |
| Location | Alaska Peninsula, United States |
| Range | Aleutian Range |
| Coordinates | 55°21′N 159°07′W |
| Type | Stratovolcano |
| Last eruption | 1946 (uncertain) |
Mount Mageik
Mount Mageik is a stratovolcano on the Alaska Peninsula within the Aleutian Range of the United States. The edifice rises above the Aniakchak and Chignik regions and is situated on the Aleutian volcanic arc, a chain related to the subduction of the Pacific Plate beneath the North American Plate. The mountain is part of a remote volcanic cluster that has attracted attention from United States Geological Survey, Alaska Volcano Observatory, and field parties from institutions such as the University of Alaska Fairbanks and the Smithsonian Institution.
Mount Mageik occupies a position on the northeastern flank of the Alaska Peninsula and is proximal to features including the Crater Lake (Aleutian Range) region and the Aniakchak National Monument and Preserve boundary. The volcano's summit and flanks drain into the Pacific Ocean via tributaries feeding Becharof Lake and coastal inlets near the Bering Sea. The geographic setting places Mageik within the Aleutians East Borough and near maritime routes used historically by the Aleut people and later by Russian Empire fur traders and United States Coast Guard cutters. Surrounding landmarks include the volcanic centers of Mount Pavlof, Mount Shishaldin, and the Novarupta complex, which together illustrate the concentration of Quaternary volcanism along the arc.
Mageik is a composite stratovolcano composed predominantly of andesitic to dacitic lavas and pyroclastic deposits typical of arc volcanism produced by the Pacific Plate–North American Plate subduction zone. Petrologic studies by researchers affiliated with U.S. Geological Survey and the University of Alaska Fairbanks indicate mineral assemblages including plagioclase, hornblende, and pyroxene in its lavas, comparable to products from Mount Veniaminof and Redoubt Volcano. Mageik's edifice overlies older Tertiary and Quaternary volcanic centers and is built upon a basement of marine sedimentary rocks related to the Aleutian Trench margin. Structural features include radial dikes, sector collapse scars, and a summit crater hosting fumarolic alteration zones analogous to those at Mount Cleveland and Mount St. Helens.
Documented eruptive activity at Mageik is sparse and partly uncertain; sporadic reports assign minor explosive events in the early to mid-20th century, and an ambiguous 1946 event has been cited by catalogers such as the Global Volcanism Program. Geochronology using radiocarbon dating and tephrochronology links Mageik to Holocene eruptive pulses that produced ash layers correlated with distant deposits recorded in cores studied by teams from Smithsonian Institution and NOAA. Eruptions have likely included explosive ash emission, pyroclastic flows, and effusive dome-building episodes comparable in style to eruptions at Mount Katmai and Mount Mageik's regional analogs like Mount Makushin. Tephra dispersal patterns from Mageik deposits indicate prevailing westerly and northwesterly winds during past eruptions, affecting aviation routes used by Alaska Airlines and flight operations overseen by the Federal Aviation Administration.
The ecological zones on Mageik reflect the subarctic maritime climate characteristic of the Alaska Peninsula. Vegetation on lower flanks includes tundra communities studied by ecologists from the University of Alaska Anchorage and the Nature Conservancy, with dwarf shrubs, sedges, and lichen-dominated surfaces similar to those found on Kodiak Island and the Kenai Peninsula. Higher elevations are sparsely vegetated, supporting avifauna such as species associated with Aleutian Islands breeding colonies and marine mammals in coastal waters monitored by Alaska Department of Fish and Game. Climatic controls are influenced by cyclonic systems tracked by the National Weather Service and sea-surface conditions modulated by the Bering Sea and Gulf of Alaska, producing heavy precipitation, persistent fog, and strong winds that affect snowpack, permafrost, and glacial remnants on the massif.
Indigenous presence in the broader region is associated with the Aleut people who utilized marine and terrestrial resources along the Alaska Peninsula for millennia; oral histories and archaeological surveys conducted by the National Park Service and Bureau of Indian Affairs document seasonal use of nearby coastal areas. Russian exploration during the era of the Russian-American Company introduced cartographic records later supplemented by expeditions from United States Geological Survey surveyors and volcanologists in the 20th century. Scientific field campaigns by the Alaska Volcano Observatory, the Smithsonian Institution's Global Volcanism Program, and universities have included tephra sampling, lava geochemistry, and geophysical surveys. Aviation and maritime support for researchers has involved collaboration with the United States Coast Guard and Alaska Air National Guard for access to remote sites.
Hazards associated with Mageik include explosive ash clouds, ballistic projectiles, pyroclastic density currents, lahars, and secondary avalanches that could threaten marine traffic and aviation corridors managed by the Federal Aviation Administration. Monitoring responsibilities fall to the Alaska Volcano Observatory in coordination with the United States Geological Survey and the University of Alaska Fairbanks, employing seismic networks, satellite remote sensing from platforms operated by NASA, and infrasound and gas-emission measurements. Tephra dispersion modeling used by the International Civil Aviation Organization and aviation advisories issued by the Alaska Aviation Weather Unit are critical for mitigating impacts on commercial and military flights. Emergency planning frameworks reference protocols from the Federal Emergency Management Agency and regional response agencies to address potential eruptions and ashfall scenarios.
Category:Stratovolcanoes of Alaska Category:Aleutian Range Category:Volcanoes of Alaska