M6.5 earthquake 79 km SSE of Atka, Alaska
A magnitude 6.5 earthquake struck 79 km SSE of Atka, Alaska on Mon, Mar 11, 1957, 8:28 PM GMT-11 (07:28 UTC), 25 km (16 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.5 (Mw, moment), strong
- Magnitude from
- ISC-GEM global catalog
- Local time
- UTC
- 1957-03-12 07:28:54 UTC
- Depth
- 25.0 km (15.5 mi), shallow
- Epicenter
- 51.587° N, 173.589° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 6.51 | Mw, moment | ISC-GEM global catalog | Preferred · Final · ±0.39 |
| 6.38 | Uk | USGS historic United States catalog | Final |
What happened
The USGS’s account of the effects of this earthquake.
Maximum observed Modified Mercalli Intensity (MMI) I
From the USGS event page for iscgem886116. U.S. Geological Survey text and figures are in the public domain.
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 3.5 and up: 5 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.8174 km SSE of Atka, Alaska · 25386 days ago · 20 km deep · 95 km away
- 5.8161 km SSE of Atka, Alaska · 25386 days ago · 18 km deep · 82 km away
- 5.8165 km SSE of Atka, Alaska · 25385 days ago · 15 km deep · 86 km away
- 5.8150 km SSE of Atka, Alaska · 25385 days ago · 15 km deep · 70 km away
- 6.065 km SE of Atka, Alaska · 25362 days ago · 35 km deep · 20 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem886116 (also filed as ushis2160). Read Fri, Oct 2, 2026, 1:03 PM UTC.