Alaska earthquakes

M2.8 earthquake 268 km WSW of Adak, Alaska

A magnitude 2.8 earthquake struck 268 km WSW of Adak, Alaska on Fri, Apr 23, 2021, 9:36 AM GMT+12 (21:36 UTC), 18 km (11 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
2.8 (ml), micro
Local time
UTC
2021-04-22 21:36:29 UTC
Depth
18.1 km (11.2 mi), shallow
Epicenter
51.220° N, 179.644° 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 15.1 km horizontally, 7.9 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
344°, poorly surrounded by stations
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 1.7176 km WSW of Adak, Alaska · 1980 days ago · 69 km deep · 97 km away
  2. 3.0197 km WSW of Adak, Alaska · 1978 days ago · 35 km deep · 89 km away
  3. 3.7248 km WSW of Adak, Alaska · 1976 days ago · 58 km deep · 33 km away
  4. 2.7Rat Islands, Aleutian Islands, Alaska · 1976 days ago · 10 km deep · 99 km away
  5. 2.0181 km WSW of Adak, Alaska · 1969 days ago · 20 km deep · 89 km away
  6. 3.8261 km W of Adak, Alaska · 1961 days ago · 178 km deep · 89 km away
  7. 2.8Rat Islands, Aleutian Islands, Alaska · 1960 days ago · 100 km deep · 97 km away
  8. 3.4202 km WSW of Adak, Alaska · 1960 days ago · 27 km deep · 70 km away
  9. 2.1184 km WSW of Adak, Alaska · 1959 days ago · 23 km deep · 89 km away
  10. 5.4288 km WSW of Adak, Alaska · 1956 days ago · 31 km deep · 21 km away · felt by 2 · tsunami flag
  11. 3.3290 km WSW of Adak, Alaska · 1956 days ago · 20 km deep · 41 km away
  12. 3.3284 km WSW of Adak, Alaska · 1956 days ago · 16 km deep · 16 km away
  13. 3.4294 km WSW of Adak, Alaska · 1956 days ago · 28 km deep · 32 km away
  14. 5.0286 km WSW of Adak, Alaska · 1955 days ago · 43 km deep · 18 km away
  15. 3.7296 km WSW of Adak, Alaska · 1934 days ago · 35 km deep · 30 km away
  16. 2.9247 km WSW of Adak, Alaska · 1930 days ago · 35 km deep · 29 km away
  17. 3.5Rat Islands, Aleutian Islands, Alaska · 1929 days ago · 16 km deep · 73 km away
  18. 3.8256 km WSW of Adak, Alaska · 1927 days ago · 54 km deep · 22 km away
  19. 2.5Rat Islands, Aleutian Islands, Alaska · 1925 days ago · 25 km deep · 53 km away
  20. 2.0Andreanof Islands, Aleutian Islands, Alaska · 1924 days ago · 90 km deep · 66 km away

Before

  1. 2.0192 km WSW of Adak, Alaska · 1982 days ago · 18 km deep · 77 km away
  2. 1.6169 km WSW of Adak, Alaska · 1984 days ago · 32 km deep · 99 km away
  3. 2.4252 km W of Adak, Alaska · 1985 days ago · 71 km deep · 75 km away
  4. 2.3224 km WSW of Adak, Alaska · 1986 days ago · 69 km deep · 67 km away
  5. 3.0204 km WSW of Adak, Alaska · 1987 days ago · 13 km deep · 91 km away
  6. 3.3229 km WSW of Adak, Alaska · 1994 days ago · 56 km deep · 45 km away
  7. 2.7212 km WSW of Adak, Alaska · 1997 days ago · 113 km deep · 59 km away
  8. 2.2203 km WSW of Adak, AK · 1999 days ago · 66 km deep · 66 km away
  9. 3.8Rat Islands, Aleutian Islands, Alaska · 2001 days ago · 101 km deep · 99 km away
  10. 3.1181 km WSW of Adak, Alaska · 2004 days ago · 35 km deep · 98 km away
  11. 3.9224 km WSW of Adak, Alaska · 2005 days ago · 51 km deep · 43 km away
  12. 3.1207 km WSW of Adak, Alaska · 2006 days ago · 10 km deep · 85 km away
  13. 3.5237 km W of Adak, Alaska · 2010 days ago · 90 km deep · 49 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e47e (also filed as ak02155kwr36). Read Thu, Sep 24, 2026, 2:34 PM UTC.