1957 Andreanof Islands earthquake

1957 Andreanof Islands earthquake
1957 Andreanof Islands earthquake is located in Alaska
Anchorage
Anchorage
1957 Andreanof Islands earthquake
UTC time1957-03-09 14:22:33
ISC event886030
USGS-ANSSComCat
Local dateMarch 9, 1957 (1957-03-09)
Local time04:22:33
Magnitude8.6 Mw[1]
8.1–8.3 Ms[2][3]
9.0 Mt[4][a]
Depth25 km (16 mi)[1]
Epicenter51°30′N 175°38′W / 51.5°N 175.63°W / 51.5; -175.63[1]
FaultAleutian Trench
TypeMegathrust
Areas affectedAleutian Islands & Hawaii
Total damage$5 million[6]
Max. intensityMMI VIII (Severe)[6]
Tsunami23 m (75 ft)[7]
Casualties2 dead (indirect)

The 1957 Andreanof Islands earthquake occurred at 04:22 local time on March 9 with a moment magnitude estimated at 8.6 and a maximum Modified Mercalli intensity of VIII (Severe). It occurred south of the Andreanof Islands group, which is part of the Aleutian Islands arc. The event occurred along the Aleutian Trench, the convergent plate boundary that separates the Pacific plate and the North American plates near Alaska. A basin-wide tsunami followed, with effects felt in Alaska and Hawaii, and strong waves recorded across the Pacific rim. Total losses were around $5 million (equivalent to $54,241,706 in 2023).

  1. ^ a b c Cite error: The named reference ISC-GEM was invoked but never defined (see the help page).
  2. ^ a b c Brockman, Espinosa & Michael 1988.
  3. ^ Kanamori 1977.
  4. ^ Abe 1979.
  5. ^ Sykes 1971.
  6. ^ a b Stover & Coffman 1993.
  7. ^ Cite error: The named reference Tsunami1957 was invoked but never defined (see the help page).


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