M4.2 earthquake 70 km SE of Atka, Alaska
A magnitude 4.2 earthquake struck 70 km SE of Atka, Alaska on Fri, May 21, 1976, 1:08 AM GMT-10 (11:08 UTC), 39 km (24 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 11:08:58 UTC
- Depth
- 39.0 km (24.2 mi), shallow
- Epicenter
- 51.717° N, 173.532° 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
- 15
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 3 in the 30 days before it.
After
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000gf2. Read Tue, Sep 22, 2026, 9:10 AM UTC.