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The Aleutian Trench (or Aleutian Trough) [1] is an oceanic trench along a convergent plate boundary which runs along the southern coastline of Alaska and the Aleutian islands. The trench extends for 3,400 kilometres (2,100 mi) from a triple junction in the west with the Ulakhan Fault and the northern end of the Kuril–Kamchatka Trench, to a ...
The Aleutian Arc was created via volcanic eruptions from dehydration of the subducting slab at ~100 km depth. The Aleutian Trench is a narrow and deep morphology that occurs between the two converging plates as the subducting slab dives beneath the overriding plate. Map of Aleutian Trench
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] The Aleutian island arc formed in the Early Eocene (55–50 Ma) when the subduction of the Pacific Plate under the North American Plate began. The ...
The Aleutian Trench, formed by the subduction of the Pacific plate under the North American plate, sits south of the island arc. [2] A forearc basin reaching depths of 7 km occupies the space between the trench and the island arc and leads up to the Aleutian Ridge, the north side of which being the area where the most volcanic activity occurs. [2]
Similar transport of sediments has been documented in the Aleutian trench. [2] In addition to sedimentation from rivers draining into a trench, sedimentation also takes place from landslides on the tectonically steepened inner slope, often driven by megathrust earthquakes. The Reloca Slide of the central Chile trench is an example of this process.
The 7.9 Mw Aleutian Islands earthquake occurred in June 2014 at an intermediate depth of 107 km. [4] The quake was caused by oblique normal faulting along the Aleutian Trench, a convergent boundary where the Pacific plate is subducting underneath the North American plate at around 59 mm/year. [5]
The Aleutian Basin is an oceanic basin located beneath the southwestern Bering Sea. While the northeastern half of the Bering Sea is situated over the North American Plate in relatively shallow waters, the Aleutian Basin comprises an oceanic plate, which is the remaining portion of the Kula Plate that was predominantly subducted beneath the ...
Map of earthquake epicenters at the Kuril–Kamchatka trench and subduction zone. Oceanic trenches are the topographic expression of subduction zones on the floor of the oceans. Oceanic trenches associated with the Ring of Fire's subduction zones are: Peru–Chile Trench; Middle America Trench; Aleutian Trench; Kuril–Kamchatka Trench; Japan ...