M4.8 earthquake 61 km SSE of Atka, Alaska
A magnitude 4.8 earthquake struck 61 km SSE of Atka, Alaska on Mon, Aug 29, 1977, 12:08 PM GMT-10 (22:08 UTC), 30 km (19 mi) below the surface.
A larger quake followed: M5.4 95 km SSE 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
- 4.8 (mb), light
- Local time
- UTC
- 1977-08-29 22:08:53 UTC
- Depth
- 30.0 km (18.6 mi), shallow
- Epicenter
- 51.665° N, 173.942° 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
- 32
Nearby
Within 100 km, magnitude 1.8 and up: 3 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.654 km SSE of Atka, Alaska · 17920 days ago · 42 km deep · 9 km away
- 5.495 km SSE of Atka, Alaska · 17920 days ago · 33 km deep · 33 km away
- 4.881 km SSE of Atka, Alaska · 17919 days ago · 43 km deep · 19 km away
Before
- 4.660 km SSE of Atka, Alaska · 17921 days ago · 37 km deep · 6 km away
- 5.472 km SSE of Atka, Alaska · 17921 days ago · 25 km deep · 11 km away
- 4.267 km WSW of Atka, Alaska · 17929 days ago · 33 km deep · 94 km away
- 4.278 km WSW of Atka, Alaska · 17932 days ago · 33 km deep · 87 km away
- 5.486 km WSW of Atka, Alaska · 17933 days ago · 57 km deep · 99 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000qd3. Read Tue, Sep 22, 2026, 9:42 AM UTC.