Alaska earthquakes

M3.1 earthquake 178 km SSW of Adak, Alaska

A magnitude 3.1 earthquake struck 178 km SSW of Adak, Alaska on Sat, Dec 18, 2021, 2:38 AM HAST (12:38 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
3.1 (ml), minor
Local time
UTC
2021-12-18 12:38:44 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.349° N, 177.434° 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 7.5 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
278°, poorly surrounded by stations
Stations used
22

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 3.2101 km SW of Adak, Alaska · 1740 days ago · 31 km deep · 90 km away
  2. 2.2171 km S of Adak, Alaska · 1736 days ago · 10 km deep · 85 km away
  3. 1.8102 km SW of Adak, Alaska · 1736 days ago · 25 km deep · 99 km away
  4. 2.8161 km S of Adak, Alaska · 1732 days ago · 10 km deep · 87 km away
  5. 1.9141 km SW of Adak, Alaska · 1730 days ago · 20 km deep · 99 km away
  6. 2.3147 km S of Adak, Alaska · 1728 days ago · 26 km deep · 46 km away
  7. 2.8123 km SW of Adak, Alaska · 1727 days ago · 35 km deep · 94 km away
  8. 2.7213 km SSW of Adak, Alaska · 1721 days ago · 10 km deep · 42 km away
  9. 4.0Andreanof Isl., Aleutian Islands, Alaska · 1718 days ago · 10 km deep · 40 km away
  10. 2.2167 km S of Adak, Alaska · 1710 days ago · 25 km deep · 50 km away
  11. 2.795 km SW of Adak, Alaska · 1710 days ago · 35 km deep · 96 km away
  12. 1.7111 km SW of Adak, Alaska · 1706 days ago · 21 km deep · 96 km away
  13. 1.5112 km SW of Adak, Alaska · 1704 days ago · 9 km deep · 99 km away
  14. 2.9116 km SW of Adak, Alaska · 1698 days ago · 35 km deep · 82 km away
  15. 2.2136 km SW of Adak, Alaska · 1694 days ago · 18 km deep · 81 km away
  16. 2.2Andreanof Islands, Aleutian Islands, Alaska · 1693 days ago · 25 km deep · 33 km away
  17. 3.2164 km S of Adak, Alaska · 1693 days ago · 10 km deep · 82 km away
  18. 2.8172 km S of Adak, Alaska · 1693 days ago · 10 km deep · 86 km away
  19. 2.1164 km S of Adak, Alaska · 1692 days ago · 14 km deep · 85 km away
  20. 2.1167 km S of Adak, Alaska · 1692 days ago · 24 km deep · 85 km away
  21. 2.7245 km SW of Adak, Alaska · 1692 days ago · 10 km deep · 90 km away
  22. 2.4227 km SSW of Adak, Alaska · 1688 days ago · 10 km deep · 57 km away
  23. 1.8120 km SW of Adak, Alaska · 1688 days ago · 26 km deep · 73 km away

Before

  1. 3.3188 km SSW of Adak, Alaska · 1749 days ago · 31 km deep · 27 km away
  2. 2.1130 km SW of Adak, Alaska · 1756 days ago · 26 km deep · 72 km away
  3. 2.994 km SW of Adak, Alaska · 1758 days ago · 35 km deep · 96 km away
  4. 2.398 km SW of Adak, Alaska · 1766 days ago · 34 km deep · 99 km away
  5. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1768 days ago · 20 km deep · 96 km away
  6. 2.3238 km SSW of Adak, Alaska · 1770 days ago · 35 km deep · 71 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gc2z (also filed as ak021g6cjqaf). Read Thu, Sep 24, 2026, 1:47 PM UTC.