M4.5 earthquake 111 km SSE of Atka, Alaska
A magnitude 4.5 earthquake struck 111 km SSE of Atka, Alaska on Wed, Dec 28, 1977, 7:49 AM GMT-11 (18:49 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 97 km ESE 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
- 4.5 (mb), light
- Local time
- UTC
- 1977-12-28 18:49:55 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.364° N, 173.296° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 17
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000s94. Read Tue, Sep 22, 2026, 10:28 AM UTC.