M6.6 earthquake 152 km WSW of Adak, Alaska
A magnitude 6.6 earthquake struck 152 km WSW of Adak, Alaska on Wed, Mar 13, 1957, 4:42 AM GMT-11 (15:42 UTC), 25 km (16 mi) below the surface.
A larger quake followed: M7.2 162 km WSW 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
- 6.6 (mw), strong
- Local time
- UTC
- 1957-03-13 15:42:11 UTC
- Depth
- 25.0 km (15.5 mi), shallow
- Epicenter
- 51.425° N, 178.721° 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
- ±0.21
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 6 in the 60 days after this one and 5 in the 30 days before it.
After
- 7.2162 km WSW of Adak, Alaska · 25392 days ago · 25 km deep · 10 km away
- 6.0Andreanof Islands, Aleutian Islands, Alaska · 25391 days ago · 35 km deep · 49 km away
- 5.8125 km WSW of Adak, Alaska · 25377 days ago · 35 km deep · 29 km away
- 5.9Andreanof Islands, Aleutian Islands, Alaska · 25368 days ago · 35 km deep · 44 km away
- 5.0135 km WSW of Adak, Alaska · 25365 days ago · 17 km away
- 5.8178 km WSW of Adak, Alaska · 25362 days ago · 35 km deep · 25 km away
Before
- 6.4133 km SW of Adak, Alaska · 25396 days ago · 10 km deep · 44 km away
- 6.5173 km WSW of Adak, Alaska · 25397 days ago · 35 km deep · 21 km away
- 7.0148 km WSW of Adak, Alaska · 25397 days ago · 25 km deep · 13 km away
- 6.2147 km WSW of Adak, Alaska · 25398 days ago · 35 km deep · 8 km away
- 6.2Andreanof Islands, Aleutian Islands, Alaska · 25398 days ago · 35 km deep · 64 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem886146 (also filed as ushis2170). Read Tue, Sep 22, 2026, 9:57 AM UTC.