M4.1 earthquake 66 km SSE of Adak, Alaska
A magnitude 4.1 earthquake struck 66 km SSE of Adak, Alaska on Mon, Dec 19, 1977, 7:10 PM GMT-11 (06:10 UTC), 53 km (33 mi) below the surface.
A larger quake followed: M5.3 44 km ESE 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
- 4.1 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1977-12-20 06:10:44 UTC
- Depth
- 53.0 km (32.9 mi), shallow
- Epicenter
- 51.321° N, 176.288° 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
- 19
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 5 in the 30 days before it.
After
- 5.344 km ESE of Adak, Alaska · 17801 days ago · 63 km deep · 54 km away
- 3.947 km SW of Adak, Alaska · 17797 days ago · 121 km deep · 69 km away
Before
- 4.065 km S of Adak, Alaska · 17818 days ago · 56 km deep · 18 km away
- 4.661 km SSE of Adak, Alaska · 17818 days ago · 54 km deep · 6 km away
- 5.176 km S of Adak, Alaska · 17819 days ago · 53 km deep · 18 km away
- 4.281 km SSE of Adak, Alaska · 17819 days ago · 44 km deep · 16 km away
- 4.368 km SSE of Adak, Alaska · 17821 days ago · 50 km deep · 3 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000s5b. Read Fri, Oct 2, 2026, 2:50 AM UTC.