M6.6 earthquake 62 km SSE of Atka, Alaska
A magnitude 6.6 earthquake struck 62 km SSE of Atka, Alaska on Sat, Mar 9, 1957, 4:06 PM GMT-11 (03:06 UTC), 25 km (16 mi) below the surface.
A larger quake followed: M6.8 99 km SW of Atka, 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
- 1957-03-10 03:06:17 UTC
- Depth
- 25.0 km (15.5 mi), shallow
- Epicenter
- 51.657° N, 173.934° 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
- ±0.39
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 8 in the 60 days after this one and 0 in the 30 days before it.
After
- 6.689 km S of Atka, Alaska · 25399 days ago · 33 km deep · 38 km away
- 6.595 km ESE of Atka, Alaska · 25399 days ago · 25 km deep · 62 km away
- 6.099 km SE of Atka, Alaska · 25398 days ago · 33 km deep · 54 km away
- 6.579 km SSE of Atka, Alaska · 25397 days ago · 25 km deep · 25 km away
- 6.899 km SW of Atka, Alaska · 25390 days ago · 15 km deep · 84 km away
- 5.8161 km SSE of Atka, Alaska · 25376 days ago · 18 km deep · 100 km away
- 5.8150 km SSE of Atka, Alaska · 25375 days ago · 15 km deep · 91 km away
- 6.065 km SE of Atka, Alaska · 25353 days ago · 35 km deep · 29 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem886056 (also filed as ushis2140). Read Wed, Sep 23, 2026, 3:21 AM UTC.