M4.8 earthquake 109 km SE of Adak, Alaska
A magnitude 4.8 earthquake struck 109 km SE of Adak, Alaska on Sun, Nov 6, 1977, 4:25 AM GMT-11 (15:25 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 76 km S of Adak, 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
- 1977-11-06 15:25:40 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.267° N, 175.392° 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
- 34
Nearby
Within 100 km, magnitude 1.8 and up: 7 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.778 km S of Atka, Alaska · 17838 days ago · 47 km deep · 79 km away
- 4.368 km SSE of Adak, Alaska · 17811 days ago · 50 km deep · 61 km away
- 4.281 km SSE of Adak, Alaska · 17809 days ago · 44 km deep · 62 km away
- 5.176 km S of Adak, Alaska · 17809 days ago · 53 km deep · 73 km away
- 4.661 km SSE of Adak, Alaska · 17808 days ago · 54 km deep · 69 km away
- 4.065 km S of Adak, Alaska · 17808 days ago · 56 km deep · 80 km away
- 4.166 km SSE of Adak, Alaska · 17808 days ago · 53 km deep · 63 km away
Before
- 5.683 km ESE of Adak, Alaska · 17853 days ago · 33 km deep · 33 km away
- 5.489 km SE of Adak, Alaska · 17854 days ago · 33 km deep · 21 km away
- 4.7103 km ESE of Adak, Alaska · 17854 days ago · 33 km deep · 13 km away
- 5.287 km ESE of Adak, Alaska · 17854 days ago · 33 km deep · 30 km away
- 6.752 km ESE of Adak, Alaska · 17854 days ago · 33 km deep · 58 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000rd9. Read Tue, Sep 22, 2026, 6:18 AM UTC.