Alaska earthquakes

M3.8 earthquake 261 km W of Adak, Alaska

A magnitude 3.8 earthquake struck 261 km W of Adak, Alaska on Thu, May 13, 2021, 3:10 AM GMT+12 (15:10 UTC), 178 km (111 mi) below the surface.

A larger quake followed: M5.4 288 km WSW of Adak, 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
3.8 (mb), minor
Local time
UTC
2021-05-12 15:10:23 UTC
Depth
178.2 km (110.7 mi), intermediate-depth
Epicenter
52.022° N, 179.576° E
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 15.0 km horizontally, 12.0 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
183°, poorly surrounded by stations
Stations used
40

Nearby

Within 100 km, magnitude 1.5 and up: 40 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 2.8Rat Islands, Aleutian Islands, Alaska · 1960 days ago · 100 km deep · 92 km away
  2. 2.9172 km W of Adak, Alaska · 1956 days ago · 10 km deep · 93 km away
  3. 5.4288 km WSW of Adak, Alaska · 1956 days ago · 31 km deep · 93 km away · felt by 2 · tsunami flag
  4. 3.3284 km WSW of Adak, Alaska · 1956 days ago · 16 km deep · 98 km away
  5. 5.0286 km WSW of Adak, Alaska · 1955 days ago · 43 km deep · 94 km away
  6. 3.8Rat Islands, Aleutian Islands, Alaska · 1950 days ago · 119 km deep · 98 km away
  7. 2.5241 km WNW of Adak, Alaska · 1945 days ago · 92 km deep · 81 km away
  8. 1.5169 km W of Adak, Alaska · 1934 days ago · 9 km deep · 98 km away
  9. 4.0Rat Islands, Aleutian Islands, Alaska · 1928 days ago · 104 km deep · 82 km away
  10. 3.8256 km WSW of Adak, Alaska · 1927 days ago · 54 km deep · 69 km away
  11. 2.0Andreanof Islands, Aleutian Islands, Alaska · 1924 days ago · 90 km deep · 48 km away
  12. 2.0Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 3 km deep · 79 km away
  13. 2.1Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 5 km deep · 77 km away
  14. 1.8Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 0 km deep · 79 km away
  15. 2.0Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 4 km deep · 79 km away
  16. 1.6Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 6 km deep · 77 km away
  17. 1.8Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 5 km deep · 78 km away
  18. 1.7Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 4 km deep · 78 km away
  19. 1.8Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 3 km deep · 79 km away
  20. 2.1Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 2 km deep · 80 km away
  21. 1.6Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 4 km deep · 80 km away
  22. 2.0Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 5 km deep · 77 km away
  23. 1.8Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 5 km deep · 79 km away
  24. 1.7Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 11 km deep · 80 km away
  25. 2.2Rat Islands, Aleutian Islands, Alaska · 1920 days ago · 5 km deep · 77 km away
  26. 1.8200 km W of Adak, Alaska · 1914 days ago · 78 km deep · 68 km away
  27. 1.9Rat Islands, Aleutian Islands, Alaska · 1914 days ago · 65 km deep · 63 km away
  28. 1.9230 km WSW of Adak, Alaska · 1911 days ago · 41 km deep · 76 km away
  29. 2.4Rat Islands, Aleutian Islands, Alaska · 1911 days ago · 98 km deep · 72 km away
  30. 3.0Rat Islands, Aleutian Islands, Alaska · 1910 days ago · 109 km deep · 68 km away
  31. 2.8Rat Islands, Aleutian Islands, Alaska · 1909 days ago · 25 km deep · 97 km away
  32. 2.5Rat Islands, Aleutian Islands, Alaska · 1909 days ago · 115 km deep · 74 km away
  33. 1.5237 km W of Adak, Alaska · 1908 days ago · 9 km deep · 62 km away
  34. 2.6Rat Islands, Aleutian Islands, Alaska · 1907 days ago · 103 km deep · 78 km away
  35. 1.7Rat Islands, Aleutian Islands, Alaska · 1907 days ago · 75 km deep · 96 km away
  36. 2.7Rat Islands, Aleutian Islands, Alaska · 1906 days ago · 84 km deep · 82 km away
  37. 2.7237 km W of Adak, Alaska · 1905 days ago · 13 km deep · 43 km away
  38. 1.8268 km WSW of Adak, Alaska · 1902 days ago · 62 km deep · 79 km away
  39. 2.2256 km W of Adak, Alaska · 1902 days ago · 141 km deep · 17 km away
  40. 2.2Rat Islands, Aleutian Islands, Alaska · 1901 days ago · 8 km deep · 82 km away

Before

  1. 1.8166 km W of Adak, Alaska · 1976 days ago · 11 km deep · 99 km away
  2. 3.7248 km WSW of Adak, Alaska · 1976 days ago · 58 km deep · 62 km away
  3. 5.0Rat Islands, Aleutian Islands, Alaska · 1979 days ago · 111 km deep · 76 km away · felt by 4 · tsunami flag
  4. 2.8268 km WSW of Adak, Alaska · 1981 days ago · 18 km deep · 89 km away
  5. 3.8Rat Islands, Aleutian Islands, Alaska · 1983 days ago · 101 km deep · 89 km away
  6. 3.1Rat Islands, Aleutian Islands, Alaska · 1984 days ago · 117 km deep · 71 km away
  7. 2.4252 km W of Adak, Alaska · 1985 days ago · 71 km deep · 17 km away
  8. 3.7261 km W of Adak, Alaska · 1987 days ago · 35 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e2gj. Read Thu, Sep 24, 2026, 3:39 PM UTC.