Alaska earthquakes

M3.3 earthquake 122 km ESE of Atka, Alaska

A magnitude 3.3 earthquake struck 122 km ESE of Atka, Alaska on Tue, Dec 21, 2021, 3:57 AM HAST (13:57 UTC), 34 km (21 mi) below the surface.

A larger quake followed: M4.2 75 km NE of Atka, 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
3.3 (ml), minor
Local time
UTC
2021-12-21 13:57:23 UTC
Depth
34.0 km (21.1 mi), shallow
Epicenter
51.831° N, 172.516° 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 2.6 km horizontally, 10.9 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
213°, poorly surrounded by stations
Stations used
23

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.8155 km SE of Atka, Alaska · 1736 days ago · 28 km deep · 60 km away
  2. 2.1Andreanof Islands, Aleutian Islands, Alaska · 1735 days ago · 17 km deep · 56 km away
  3. 3.175 km SE of Atka, Alaska · 1734 days ago · 33 km deep · 55 km away
  4. 2.191 km ESE of Atka, Alaska · 1731 days ago · 13 km deep · 33 km away
  5. 4.1142 km ESE of Atka, Alaska · 1719 days ago · 35 km deep · 27 km away
  6. 4.275 km NE of Atka, Alaska · 1717 days ago · 187 km deep · 99 km away
  7. 3.5112 km SE of Atka, Alaska · 1714 days ago · 41 km deep · 34 km away
  8. 2.8128 km E of Atka, Alaska · 1714 days ago · 53 km deep · 57 km away
  9. 3.160 km SE of Atka, Alaska · 1709 days ago · 6 km deep · 69 km away
  10. 2.956 km ESE of Atka, Alaska · 1709 days ago · 14 km deep · 67 km away
  11. 3.066 km SSE of Atka, Alaska · 1709 days ago · 35 km deep · 82 km away
  12. 3.4203 km ESE of Atka, Alaska · 1709 days ago · 38 km deep · 85 km away
  13. 3.2209 km ESE of Atka, Alaska · 1709 days ago · 35 km deep · 88 km away
  14. 3.184 km ESE of Atka, Alaska · 1703 days ago · 35 km deep · 39 km away
  15. 2.962 km ESE of Atka, Alaska · 1703 days ago · 35 km deep · 62 km away
  16. 3.7Andreanof Islands, Aleutian Islands, Alaska · 1701 days ago · 42 km deep · 23 km away
  17. 3.2165 km SE of Atka, Alaska · 1696 days ago · 10 km deep · 87 km away
  18. 2.762 km SSE of Atka, Alaska · 1694 days ago · 35 km deep · 88 km away
  19. 3.2102 km ESE of Atka, Alaska · 1693 days ago · 35 km deep · 20 km away
  20. 3.2187 km E of Atka, Alaska · 1692 days ago · 35 km deep · 76 km away
  21. 3.2213 km ESE of Atka, Alaska · 1692 days ago · 35 km deep · 91 km away
  22. 2.157 km SE of Atka, Alaska · 1690 days ago · 34 km deep · 81 km away
  23. 3.0Andreanof Islands, Aleutian Islands, Alaska · 1688 days ago · 10 km deep · 43 km away
  24. 2.157 km SE of Atka, Alaska · 1686 days ago · 24 km deep · 69 km away
  25. 1.955 km ESE of Atka, Alaska · 1685 days ago · 58 km deep · 67 km away
  26. 2.335 km ESE of Atka, Alaska · 1682 days ago · 148 km deep · 86 km away
  27. 2.9193 km E of Atka, Alaska · 1679 days ago · 36 km deep · 79 km away

Before

  1. 2.250 km ESE of Atka, Alaska · 1741 days ago · 62 km deep · 72 km away
  2. 3.1169 km SE of Atka, Alaska · 1742 days ago · 10 km deep · 60 km away
  3. 4.084 km SE of Atka, Alaska · 1746 days ago · 35 km deep · 55 km away
  4. 2.971 km ESE of Atka, Alaska · 1747 days ago · 40 km deep · 52 km away
  5. 4.0189 km ESE of Atka, Alaska · 1748 days ago · 39 km deep · 69 km away
  6. 2.879 km ESE of Atka, Alaska · 1756 days ago · 32 km deep · 45 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gchm (also filed as ak021gbbv4q9). Read Thu, Sep 24, 2026, 1:02 PM UTC.