M4.2 earthquake 64 km SE of Atka, Alaska
A magnitude 4.2 earthquake struck 64 km SE of Atka, Alaska on Thu, May 20, 1976, 8:10 PM GMT-10 (06:10 UTC), 46 km (29 mi) below the surface.
A larger quake followed: M4.9 69 km SE 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
- 4.2 (mb), light
- Local time
- UTC
- 1976-05-21 06:10:59 UTC
- Depth
- 46.0 km (28.6 mi), shallow
- Epicenter
- 51.729° N, 173.644° 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.
- Stations used
- 25
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.062 km SE of Atka, Alaska · 18386 days ago · 30 km deep · 6 km away
- 4.270 km SE of Atka, Alaska · 18386 days ago · 39 km deep · 8 km away
- 4.969 km SE of Atka, Alaska · 18386 days ago · 45 km deep · 7 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000gew. Read Tue, Sep 22, 2026, 8:20 AM UTC.