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The island is home to a large volcanic caldera on Mount Okmok and the only field of geysers in Alaska. It is separated from Unalaska Island by Umnak Pass. [5] [6] In 2000, Umnak was permanently inhabited by only 39 people and by 2010, around 18, placing the settlement of Nikolski in difficulty and its school was closed.
Umnak island is on Cretaceous seafloor; [50] the submerged Umnak oceanic plateau might extend under the island. [51] Southwest of Okmok, a ridge formed by Tertiary volcanic rocks joins the volcano to the rest of Umnak island [52] and the volcanoes Recheshnoi and Vsevidof. [22] Northeast of Okmok is the Idak plateau, an uplifted older volcano. [17]
Mount Recheshnoi (also spelled Recheschnoi) is a heavily eroded stratovolcano located near the center of the SW lobe of Umnak Island in the Aleutian Islands of Alaska.. The northeast flank of Recheshnoi has one of the hottest and most extensive thermal areas in Alaska.
The largest of those is Unimak Island, with an area of 1,571.41 mi 2 (4,069.9 km 2), followed by Unalaska Island, the only other Aleutian Island with an area over 1,000 square miles (2,600 km 2). The axis of the archipelago near the mainland of Alaska has a southwest trend, but at Tanaga Island (about 178° W) its direction changes to the ...
Mount Vsevidof (/ ˌ v ɪ z ə ˈ v iː d ɒ f / or / v ə ˈ ʃ eɪ v ɪ d ɒ f /; [4] Russian: Вулкан Всевидова) is a stratovolcano in the U.S. state of Alaska. Its summit is the highest point on Umnak Island, one of the eastern Aleutian Islands. Its symmetrical cone rises abruptly from its surroundings.
When the Alaska National Interest Lands Conservation Act was passed on 2 December 1980, 910,000 acres (370,000 ha) of the island was designated as wilderness. [2] This area is managed by the United States Fish and Wildlife Service as part of the Alaska Maritime National Wildlife Refuge.