Aleutian Trench
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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.
The Aleutian arc is a typical oceanic arc of most subduction zones. The angle of dip of the descending lithosphere, which is Pacific Plate, along much of the Aleutian treach is near 45 degree.
