Alaska earthquakes

M3.7 earthquake 121 km SSE of Akhiok, Alaska

A magnitude 3.7 earthquake struck 121 km SSE of Akhiok, Alaska on Sun, Dec 26, 2021, 10:03 PM AKST (07:03 UTC), 43 km (26 mi) below the surface.

A larger quake followed: M3.9 84 km S of Akhiok, Alaska. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
3.7 (ML, local (Richter)), minor
Magnitude from
Alaska Earthquake Center
Local time
UTC
2021-12-27 07:03:23 UTC
Depth
42.5 km (26.4 mi), shallow
Epicenter
55.925° N, 153.476° W
Region
Alaska
Strongest shaking
I, not felt shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.ScaleComputed byNotes
3.7ML, local (Richter)Alaska Earthquake CenterPreferred · Preliminary
4.2mb, body-waveUSGS National Earthquake Information CenterReviewed · ±0.116 · 23 stations

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
I, not felt shaking
Peak ground acceleration
0.0% of gravity
Peak ground velocity
-4.5 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

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
78

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 3.753 km SSE of Old Harbor, Alaska · 1738 days ago · 7 km deep · 92 km away
  2. 3.377 km S of Akhiok, Alaska · 1731 days ago · 32 km deep · 63 km away
  3. 3.984 km S of Akhiok, Alaska · 1731 days ago · 38 km deep · 64 km away
  4. 3.455 km SSW of Akhiok, Alaska · 1731 days ago · 36 km deep · 96 km away
  5. 2.528 km SSW of Akhiok, Alaska · 1731 days ago · 7 km deep · 100 km away
  6. 2.4102 km SSE of Akhiok, Alaska · 1724 days ago · 8 km deep · 25 km away
  7. 2.9175 km SE of Akhiok, Alaska · 1722 days ago · 8 km deep · 70 km away
  8. 2.393 km SSE of Old Harbor, Alaska · 1722 days ago · 11 km deep · 72 km away
  9. 2.043 km ESE of Akhiok, Alaska · 1719 days ago · 6 km deep · 94 km away
  10. 2.7163 km SSE of Old Harbor, Alaska · 1706 days ago · 30 km deep · 63 km away
  11. 2.2104 km SE of Akhiok, Alaska · 1706 days ago · 11 km deep · 39 km away
  12. 2.789 km SE of Akhiok, Alaska · 1706 days ago · 33 km deep · 43 km away
  13. 2.792 km SSE of Akhiok, Alaska · 1706 days ago · 33 km deep · 37 km away
  14. 2.491 km SE of Old Harbor, Alaska · 1706 days ago · 14 km deep · 93 km away
  15. 2.394 km SSE of Old Harbor, Alaska · 1706 days ago · 20 km deep · 72 km away
  16. 2.3103 km SE of Akhiok, Alaska · 1705 days ago · 8 km deep · 43 km away
  17. 2.999 km SSE of Old Harbor, Alaska · 1705 days ago · 16 km deep · 74 km away
  18. 2.498 km SSE of Old Harbor, Alaska · 1705 days ago · 12 km deep · 77 km away
  19. 3.1131 km SSE of Akhiok, Alaska · 1691 days ago · 24 km deep · 15 km away
  20. 3.1116 km SSE of Akhiok, Alaska · 1691 days ago · 6 km deep · 26 km away
  21. 2.440 km SE of Akhiok, Alaska · 1691 days ago · 21 km deep · 88 km away
  22. 3.0108 km SSE of Akhiok, Alaska · 1690 days ago · 4 km deep · 29 km away · felt by 1
  23. 2.9124 km SE of Akhiok, Alaska · 1689 days ago · 33 km deep · 33 km away
  24. 2.493 km SSE of Old Harbor, Alaska · 1689 days ago · 10 km deep · 82 km away
  25. 2.4102 km SE of Akhiok, Alaska · 1688 days ago · 8 km deep · 37 km away
  26. 2.7105 km SE of Akhiok, Alaska · 1688 days ago · 4 km deep · 37 km away
  27. 2.4108 km SE of Akhiok, Alaska · 1688 days ago · 10 km deep · 40 km away
  28. 2.653 km SSE of Old Harbor, Alaska · 1688 days ago · 16 km deep · 95 km away
  29. 3.2200 km S of Akhiok, Alaska · 1682 days ago · 10 km deep · 90 km away

Before

  1. 3.6Kodiak Island region, Alaska · 1751 days ago · 11 km deep · 93 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021gl5709g (also filed as us6000gfkf). Read Fri, Oct 2, 2026, 10:11 PM UTC.