Alaska earthquakes

M2.4 earthquake 252 km W of Adak, Alaska

A magnitude 2.4 earthquake struck 252 km W of Adak, Alaska on Sun, Apr 18, 2021, 6:26 PM GMT+12 (06:26 UTC), 71 km (44 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
2.4 (ml), micro
Local time
UTC
2021-04-18 06:26:50 UTC
Depth
71.0 km (44.1 mi), intermediate-depth
Epicenter
51.891° N, 179.702° 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.

Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 3.1Rat Islands, Aleutian Islands, Alaska · 1987 days ago · 117 km deep · 83 km away
  2. 3.8Rat Islands, Aleutian Islands, Alaska · 1986 days ago · 101 km deep · 97 km away
  3. 2.0192 km WSW of Adak, Alaska · 1985 days ago · 18 km deep · 99 km away
  4. 1.9165 km WSW of Adak, Alaska · 1984 days ago · 16 km deep · 100 km away
  5. 2.8268 km WSW of Adak, Alaska · 1984 days ago · 18 km deep · 75 km away
  6. 5.0Rat Islands, Aleutian Islands, Alaska · 1982 days ago · 111 km deep · 85 km away · felt by 4 · tsunami flag
  7. 3.7248 km WSW of Adak, Alaska · 1979 days ago · 58 km deep · 46 km away
  8. 1.8166 km W of Adak, Alaska · 1979 days ago · 11 km deep · 88 km away
  9. 3.8261 km W of Adak, Alaska · 1964 days ago · 178 km deep · 17 km away
  10. 2.8Rat Islands, Aleutian Islands, Alaska · 1963 days ago · 100 km deep · 94 km away
  11. 2.9172 km W of Adak, Alaska · 1959 days ago · 10 km deep · 81 km away
  12. 5.4288 km WSW of Adak, Alaska · 1959 days ago · 31 km deep · 81 km away · felt by 2 · tsunami flag
  13. 3.3284 km WSW of Adak, Alaska · 1959 days ago · 16 km deep · 85 km away
  14. 5.0286 km WSW of Adak, Alaska · 1958 days ago · 43 km deep · 81 km away
  15. 2.5241 km WNW of Adak, Alaska · 1948 days ago · 92 km deep · 91 km away
  16. 1.5169 km W of Adak, Alaska · 1937 days ago · 9 km deep · 86 km away
  17. 3.7296 km WSW of Adak, Alaska · 1937 days ago · 35 km deep · 98 km away
  18. 2.9247 km WSW of Adak, Alaska · 1933 days ago · 35 km deep · 91 km away
  19. 4.0Rat Islands, Aleutian Islands, Alaska · 1931 days ago · 104 km deep · 89 km away
  20. 3.8256 km WSW of Adak, Alaska · 1930 days ago · 54 km deep · 53 km away

Before

  1. 3.7261 km W of Adak, Alaska · 1990 days ago · 35 km deep · 30 km away
  2. 3.3229 km WSW of Adak, Alaska · 1997 days ago · 56 km deep · 51 km away
  3. 2.7212 km WSW of Adak, Alaska · 2000 days ago · 113 km deep · 59 km away
  4. 2.2203 km WSW of Adak, AK · 2002 days ago · 66 km deep · 76 km away
  5. 3.8Rat Islands, Aleutian Islands, Alaska · 2005 days ago · 101 km deep · 76 km away
  6. 3.9224 km WSW of Adak, Alaska · 2008 days ago · 51 km deep · 71 km away
  7. 3.5237 km W of Adak, Alaska · 2013 days ago · 90 km deep · 35 km away
  8. 3.1224 km W of Adak, Alaska · 2016 days ago · 128 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0214yprrfs. Read Sun, Sep 27, 2026, 4:32 PM UTC.