The 1957 Andreanof Islands earthquake was a magnitude 8.6 MW (8.3 Ms[2]) megathrust earthquake that took place on March 9, 1957.[2] It was centered at 51°30′N 175°42′W / 51.5°N 175.7°W in the Alaska-Aleutian megathrust, south of the Andreanof Islands group of the Aleutian Islands in the U.S. state of Alaska.
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