1957 Andreanof Islands earthquake

1957 Andreanof Islands earthquake

Date	9 March 1957 (1957-03-09)
Origin time	14:22 (UTC)
Magnitude	8.6 Mw
Epicenter	51°30′N 175°42′W / 51.5°N 175.7°W / 51.5; -175.7
Areas affected	Aleutian Islands & Hawaii
Tsunami	Yes
Casualties	0

The 1957 Andreanof Islands earthquake was a magnitude 8.6 M_W^[1] (8.3 M_s^[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 / 51.5; -175.7 in the Alaska-Aleutian megathrust, south of the Andreanof Islands group of the Aleutian Islands in the U.S. state of Alaska.

The earthquake caused damage to infrastructure on Adak Island and Umnak Island, as well as causing an eruption of long-dormant volcano Mount Vsevidof. It also caused a tsunami that reached a height of 16 meters (52 ft) and caused around $5,000,000 in damage^[2] in Hawaii, destroying two villages on Oahu, and two bridges in the Aleutian region. No lives were lost in either the earthquake or the tsunami.

As of 2009 it remains the fourth largest-magnitude quake in the United States.^[3]

See also

• 2007 Andreanof Islands earthquake
• List of earthquakes in the United States
• List of earthquakes in Alaska

References

External links

• USGS Earthquake Hazards Program - Andreanof Islands, Alaska, Magnitude 8.6
• Tsunami! - 1957 Aleutian tsunami

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