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Motion between the Kula Plate and the North American Plate along the margin of the Bering Shelf (in the Bering Sea north of the Aleutian arc) ended in the early Eocene.The Aleutian Basin, the ocean floor north of the Aleutian arc, is the remainder of the Kula Plate that was trapped when volcanism and subduction jumped south to its current location at c. 56 Ma. [8]
Map of the western Aleutian Islands, showing the Near Islands on the left: Attu Island (1), Agattu Island (2), Alaid Island (3), Nizki Island (4), and Shemya Island (5). The Near Islands or Sasignan Islands (Aleut: Sasignan tanangin, [1] Russian: Ближние острова) are a group of American islands in the Aleutian Islands in southwestern Alaska, between the Russian Commander Islands ...
The Aleutian island arc formed ~50-55 ma as a result of Kula Plate subduction under the North American Plate before the Pacific plate arrived. [3] There are three stratigraphic units of the Aleutian island arc: volcanic rocks from ~55-33 ma, marine sedimentary rocks from ~23-33 ma, and sedimentary and igneous rocks from ~5 ma-present. [3]
Agattu (Aleut: Angatux̂; [1] Russian: Агатту) is an island in Alaska, part of the Near Islands in the western end of the Aleutian Islands. With a land area of 85.558 square miles (221.59 km 2) Agattu is one of the largest uninhabited islands in the Aleutians. It is the second largest of the Near Islands, after Attu Island. It is volcanic ...
Map of Rat Islands showing major islands (line between Semisopochnoi Island and Amchitka Pass is the 180th meridian) Map of the western Aleutian Islands, showing the Rat Islands on the right: Kiska Island (7), Little Kiska Island (8), Segula Island (9), Khvostof Island (10), Davidof Island (11), Little Sitkin Island (12), Hawadax Island (13), Amchitka Island (14), and Semisopochnoi Island (15)
The Aleutian Arc is a large volcanic arc of islands extending from the Southwest tip of the U.S. state of Alaska to the Kamchatka Peninsula of the Russian Federation. It consists of a number of active and dormant volcanoes that have formed as a result of the subduction of the Pacific plate beneath the North American plate along the Aleutian ...
The Alaska Peninsula [1] (also called Aleut Peninsula [2] or Aleutian Peninsula, [3] Aleut: Alasxix̂; Sugpiaq: Aluuwiq, Al'uwiq) is a peninsula extending about 497 mi (800 km) to the southwest from the mainland of Alaska and ending in the Aleutian Islands. The peninsula separates the Pacific Ocean from Bristol Bay, an arm of the Bering Sea.
Attu (Aleut: Atan, [1] Russian: Атту) is an island in the Near Islands (part of the Aleutian Islands chain). It is one of the westernmost points of the U.S. state of Alaska. The island became uninhabited in 2010, making it the largest uninhabited island that is part of the United States politically. [2]