M4.3 earthquake 68 km SSE of Adak, Alaska
A magnitude 4.3 earthquake struck 68 km SSE of Adak, Alaska on Sat, Dec 17, 1977, 2:58 AM GMT-11 (13:58 UTC), 50 km (31 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
- 4.3 (mb), light
- Local time
- UTC
- 1977-12-17 13:58:43 UTC
- Depth
- 50.0 km (31.1 mi), shallow
- Epicenter
- 51.301° N, 176.270° 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
- 30
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 0 in the 30 days before it.
After
- 4.281 km SSE of Adak, Alaska · 17809 days ago · 44 km deep · 14 km away
- 5.176 km S of Adak, Alaska · 17809 days ago · 53 km deep · 17 km away
- 4.661 km SSE of Adak, Alaska · 17809 days ago · 54 km deep · 9 km away
- 4.065 km S of Adak, Alaska · 17808 days ago · 56 km deep · 19 km away
- 4.166 km SSE of Adak, Alaska · 17808 days ago · 53 km deep · 3 km away
- 5.344 km ESE of Adak, Alaska · 17791 days ago · 63 km deep · 56 km away
- 3.947 km SW of Adak, Alaska · 17788 days ago · 121 km deep · 71 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000s44. Read Tue, Sep 22, 2026, 10:59 AM UTC.