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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 Trench.
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]
Name Elevation Location Last eruption meters feet Coordinates; Mount Adagdak: 645: 2115: 210,000 ± 5,000 years ago Mount Akutan: 1303: 4275: 1996 Alagogshak: 1675
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 all coordinates using OpenStreetMap. ... Volcanoes of the Aleutian Islands (28 P) C. ... Pages in category "Volcanoes of Alaska"
The volcano erupted most recently in 1992, but there is still fumarolic activity at the base of Lava Point and there are hot springs North-East of the caldera. [1] In March 1996, an earthquake swarm was followed by deformation of the volcanic edifice, including a lowering of the eastern side and a rise of the western side of the volcano.
Three volcanoes in Alaska's Aleutian Islands are erupting at the same time, with at least two spewing low levels of ash and steam.
Mountains of the Alaska Peninsula and Unimak Island; Chigmit Mountains; Neacola Mountains; See Aleutian Islands for the continuation of the range to the west of Unimak Island. Just to the north of the Aleutian Range are the Tordrillo Mountains, the southeasternmost extent of the Alaska Range. [1] Selected mountains: Mount Redoubt (3,108 m ...