Alaska-Aleutian megathrust

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Tectonic map of Alaska and northwestern Canada showing main faults and historic earthquakes

The Alaska-Aleutian megathrust is a thrust fault that runs for 3,600 km from near Kamchatka in the west to the Gulf of Alaska in the east.[1]

The Alaska-Aleutian megathust system forms the interface between the subducting Pacific Plate and the overriding North American Plate.

Movement on this megathrust plate system has been responsible for several great historical earthquakes including the M 9.2 1964 Alaska earthquake, M 8.7 1965 Rat Islands earthquake and the M 8.6 1957 Andreanof Islands earthquake, each of them triggering large tsunamis.


  1. ^ National Research Council (U.S.). Committee on the Science of Earthquakes (2003). "3.2 Seismic Hazards in the United States". Living on an Active Earth: Perspectives on Earthquake Science. p. 136. ISBN 9780309065627. Retrieved 9 May 2012.