M6.3 earthquake 143 km E of Atka, Alaska
A magnitude 6.3 earthquake struck 143 km E of Atka, Alaska on Thu, Apr 4, 1957, 3:49 PM GMT-11 (02:49 UTC), 35 km (22 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.3 (mw), strong
- Local time
- UTC
- 1957-04-05 02:49:47 UTC
- Depth
- 35.0 km (21.7 mi), shallow
- Epicenter
- 52.011° N, 172.133° 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
- ±0.24
- Depth from
- From location
Nearby
Within 100 km, magnitude 3.3 and up: 0 in the 60 days after this one and 6 in the 30 days before it.
Before
- 5.8220 km ESE of Atka, Alaska · 25388 days ago · 25 km deep · 90 km away
- 6.0182 km E of Atka, Alaska · 25392 days ago · 50 km away
- 6.0164 km WSW of Nikolski, Alaska · 25399 days ago · 39 km deep · 80 km away
- 6.1207 km ESE of Atka, Alaska · 25404 days ago · 35 km deep · 69 km away
- 6.099 km SE of Atka, Alaska · 25406 days ago · 33 km deep · 86 km away
- 6.595 km ESE of Atka, Alaska · 25406 days ago · 25 km deep · 70 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem886326 (also filed as ushis2212). Read Wed, Sep 30, 2026, 3:57 PM UTC.