The Aleutian Trench is an oceanic trench in the Earth's crust. It is classified as a marginal trench in the east but is termed an island arc west of Alaska. The trench extends for 3,400 km from the northern end of the Kuril-Kamchatka Trench to the Gulf of Alaska, marking the boundary where two tectonic plates meet, a subduction zone where the Pacific Plate is being subducted under the North American Plate. Image File history File links Download high resolution version (1000x461, 119 KB) Summary The Aleutian Trench Source: http://www. ... The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. ... An island arc is a type of archipelago formed by plate tectonics as one oceanic tectonic plate subducts under another and produces magma. ... Official language(s) English Capital Juneau Largest city Anchorage Area Ranked 1st - Total 663,267 sq mi (1,717,854 km²) - Width 808 miles (1,300 km) - Length 1,479 miles (2,380 km) - % water 13. ... The Kuril-Kamchatka Trench or Kuril Trench is an oceanic trench with a maximum depth of 10500 m (34000 ft). ... The Gulf of Alaska is an arm of the Pacific Ocean defined by the curve of the southern coast of Alaska, stretching from the Alaska Peninsula and Kodiak Island in the west to the Alexander Archipelago in the east, where Glacier Bay and the Inside Passage are to be found. ... The Pacific plate is shown in pale yellow on this map The Pacific Plate is an oceanic tectonic plate beneath the Pacific Ocean. ... The North American plate is shown in brown on this map The North American Plate is a continental tectonic plate covering most of North America, extending eastward to the Mid-Atlantic Ridge and westward to the Cherskiy Range in East Siberia. ...
Bounded S by the Aleutiantrench, a deep chasm in the ocean floor known as a subduction zone.
The Aleutians are composed of 4 main groups: Fox Isls., nearest to the mainland, including Unimak, Unalaska, Umnak, and Akutan; Andreanof Isls., including Amlia, Atka, Adak, Kanaga, and Tanaga; Rat Isls., including Amchitka and Kiska; and Near Isls., smallest and westernmost group, including Agattu and Attu.
The Aleutians have few settlements and few good harbors, most are on the N sides of the isls.
Trenches along with volcanic arcs and zones of earthquakes that dip under the volcanic arc as deeply as 700 km are diagnostic of convergent plate boundaries and their deeper manifestations, subduction zones.
Trenches are centerpieces of the distinctive physiography of a convergent plate margin.
Trenches distant from an influx of continental sediments lack an accretionary prism, and the inner slope of such trenches is commonly composed of igneous or metamorphic rocks.
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