  Anchorage  | |
| UTC time | 1957-03-09 14:22:33 |
|---|---|
| ISC event | 886030 |
| USGS-ANSS | ComCat |
| Local date | March 9, 1957 |
| Local time | 04:22:33 |
| Magnitude | 8.6 Mw[1] 8.1–8.3 Ms[2][3] 9.0 Mt[4][a] |
| Depth | 25 km (16 mi)[1] |
| Epicenter | 51°30′N 175°38′W / 51.5°N 175.63°W[1] |
| Fault | Aleutian Trench |
| Type | Megathrust |
| Areas affected | Aleutian Islands & Hawaii |
| Total damage | $5 million[6] |
| Max. intensity | MMI VIII (Severe)[6] |
| Tsunami | 23 m (75 ft)[7] |
| Casualties | 2 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).
- ^ a b c Cite error: The named reference
ISC-GEMwas invoked but never defined (see the help page). - ^ a b c Brockman, Espinosa & Michael 1988.
- ^ Kanamori 1977.
- ^ Abe 1979.
- ^ Sykes 1971.
- ^ a b Stover & Coffman 1993.
- ^ Cite error: The named reference
Tsunami1957was invoked but never defined (see the help page).
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).