Alaska earthquakes

M2.8 earthquake 161 km S of Adak, Alaska

A magnitude 2.8 earthquake struck 161 km S of Adak, Alaska on Mon, Dec 27, 2021, 3:22 PM HAST (01:22 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.0 Andreanof Isl., Aleutian Islands, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.8 (ml), micro
Local time
UTC
2021-12-28 01:22:31 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.446° N, 176.221° 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.

Location uncertainty
About 3.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
286°, poorly surrounded by stations
Stations used
22

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 2.3147 km S of Adak, Alaska · 1728 days ago · 26 km deep · 48 km away
  2. 2.8199 km SSW of Atka, Alaska · 1727 days ago · 10 km deep · 100 km away
  3. 2.7213 km SSW of Adak, Alaska · 1721 days ago · 10 km deep · 89 km away
  4. 4.0Andreanof Isl., Aleutian Islands, Alaska · 1718 days ago · 10 km deep · 66 km away
  5. 2.2167 km S of Adak, Alaska · 1710 days ago · 25 km deep · 37 km away
  6. 2.195 km S of Adak, Alaska · 1707 days ago · 26 km deep · 66 km away
  7. 1.772 km SSE of Adak, Alaska · 1706 days ago · 2 km deep · 89 km away
  8. 1.978 km SSE of Adak, Alaska · 1694 days ago · 20 km deep · 85 km away
  9. 2.2Andreanof Islands, Aleutian Islands, Alaska · 1693 days ago · 25 km deep · 65 km away
  10. 3.2164 km S of Adak, Alaska · 1693 days ago · 10 km deep · 6 km away
  11. 2.8172 km S of Adak, Alaska · 1693 days ago · 10 km deep · 11 km away
  12. 2.1164 km S of Adak, Alaska · 1693 days ago · 14 km deep · 4 km away
  13. 2.1167 km S of Adak, Alaska · 1693 days ago · 24 km deep · 6 km away
  14. 1.665 km SSE of Adak, Alaska · 1692 days ago · 28 km deep · 96 km away
  15. 2.9200 km SE of Adak, Alaska · 1685 days ago · 10 km deep · 94 km away
  16. 3.0201 km SSE of Adak, Alaska · 1678 days ago · 23 km deep · 80 km away
  17. 3.0217 km SSW of Adak, Alaska · 1674 days ago · 10 km deep · 94 km away
  18. 2.3193 km SSE of Adak, Alaska · 1673 days ago · 32 km deep · 35 km away

Before

  1. 2.2171 km S of Adak, Alaska · 1736 days ago · 10 km deep · 10 km away
  2. 2.7186 km SSE of Adak, Alaska · 1737 days ago · 10 km deep · 77 km away
  3. 3.1178 km SSW of Adak, Alaska · 1741 days ago · 10 km deep · 87 km away
  4. 2.3161 km SE of Adak, Alaska · 1741 days ago · 10 km deep · 93 km away
  5. 2.574 km SSE of Adak, Alaska · 1759 days ago · 26 km deep · 87 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gel9 (also filed as ak021gmp9v01). Read Thu, Sep 24, 2026, 2:15 PM UTC.