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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 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 ...
Tectonic map of Alaska and northwestern Canada showing main faults and historic earthquakes. The Queen Charlotte Fault is an active transform fault that marks the boundary of the North American plate and the Pacific plate. [1] [2] It is Canada's right-lateral strike-slip equivalent to the San Andreas Fault to the south in California. [3]
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.
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]
UTC time: 1946-04-01 12:29:01: ISC event: 898313: USGS-ANSSComCat: Local date: April 1, 1946 (): Local time: 02:29: Magnitude: 7.4 M s, 8.6 M w, 9.3 M t: Depth: 15 km (9.3 mi) [1] Epicenter: 1]: Type: Megathrust: Areas affected: Hawaii, Alaska United States: Max. intensity: MMI VI (Strong): Tsunami: Up to 42 m (138 ft) at Unimak Island: Casualties: 165–173 [2]: The 1946 Aleutian Islands ...
Earthquakes are common on the West Coast, with multiple plate boundaries like the San Andreas fault making geologic activity more likely. They are rarer on the East Coast, but they do happen .
Tremor and slow-slip earthquakes have also been observed in the Aleutian subduction zone. [2] The low frequency earthquake (LFE) hypocenters associated with these processes are located near Kodiak Island, Shumagin Gap, Unalaska, and the Andreanof Islands, down-dip of these great megathrust events, where the two converging plates are thought to ...