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Here, the Pacific Plate is being subducted underneath the North American Plate and the rate of subduction changes from west to east from 7.5 to 5.1 cm (3.0 to 2.0 in) per year. [2] The Aleutian subduction zone includes two prominent features, the Aleutian Arc and the Aleutian Trench. The Aleutian Arc was created via volcanic eruptions from ...
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 ...
Map showing the tectonics and seismicity of Alaska. The Aleutian Islands lie between Kamchatka and mainland Alaska. They were formed as the result of the 4,000 km (2,500 mi) long convergent boundary that accommodates the subduction of the oceanic Pacific plate underneath the continental North American plate. [8]
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]
The 1964 Alaska earthquake, also known as the Great Alaska earthquake and Good Friday earthquake, occurred at 5:36 PM AKST on Good Friday, March 27, 1964. [2] Across south-central Alaska , ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 131 deaths.
Off the coast of Alaska lies the Aleutian subduction zone–a 2,500 mile long convergent plate boundary where the Pacific plate subducts under the North American plate at a rate of 6–7 cm/yr. This megathrust fault has been the source of many large earthquakes including the 1964 Alaskan earthquake that registered a magnitude 9.2 and remains ...
Tectonic map of Alaska and northwestern Canada showing main faults and historic earthquakes Denali Fault and the Denali National Park boundary. The Denali Fault is a major intracontinental dextral (right lateral) strike-slip fault in western North America, extending from northwestern British Columbia, Canada to the central region of the U.S. state of Alaska.
The subduction zone is a large thrust fault capable of generating large megathrust earthquakes, sometimes tsunamigenic. The 1946 Aleutian Islands earthquake and 1964 Alaska earthquake, measuring 8.6 M w and 9.2 M w respectively, are examples of earthquakes on the subduction zone; both resulted in devastating tsunamis. [17] [18]