M6.4 earthquake 133 km SW of Adak, Alaska
A magnitude 6.4 earthquake struck 133 km SW of Adak, Alaska on Mon, Mar 11, 1957, 8:39 PM GMT-11 (07:39 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M7.1 60 km SW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.4 (mw), strong
- Local time
- UTC
- 1957-03-12 07:39:20 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 51.191° N, 178.214° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Magnitude uncertainty
- ±0.20
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 9 in the 60 days after this one and 4 in the 30 days before it.
After
- 7.160 km SW of Adak, Alaska · 25396 days ago · 20 km deep · 75 km away
- 6.6152 km WSW of Adak, Alaska · 25395 days ago · 25 km deep · 44 km away
- 7.2162 km WSW of Adak, Alaska · 25393 days ago · 25 km deep · 52 km away
- 6.0Andreanof Islands, Aleutian Islands, Alaska · 25391 days ago · 35 km deep · 86 km away
- 6.061 km SSW of Adak, Alaska · 25389 days ago · 35 km deep · 96 km away
- 5.8125 km WSW of Adak, Alaska · 25377 days ago · 35 km deep · 45 km away
- 5.9Andreanof Islands, Aleutian Islands, Alaska · 25368 days ago · 35 km deep · 33 km away
- 5.0135 km WSW of Adak, Alaska · 25365 days ago · 40 km away
- 5.8178 km WSW of Adak, Alaska · 25362 days ago · 35 km deep · 63 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem886117 (also filed as ushis2161). Read Tue, Sep 22, 2026, 3:34 PM UTC.