Alaska earthquakes

M1.6 earthquake 255 km W of Adak, Alaska

A magnitude 1.6 earthquake struck 255 km W of Adak, Alaska on Sun, Dec 21, 2025, 10:22 PM GMT+12 (10:22 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M4.9 Rat Islands, 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
1.6 (ML, local (Richter)), micro
Magnitude from
AV
Local time
UTC
2025-12-21 10:22:03 UTC
Depth
3.6 km (2.2 mi), shallow
Epicenter
51.791° N, 179.658° 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 1.9 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.28
Depth from
From location
Station coverage gap
323°, poorly surrounded by stations
Stations used
5

Nearby

Within 100 km, magnitude 1.5 and up: 35 in the 60 days after this one and 37 in the 30 days before it.

After

  1. 2.8181 km WSW of Adak, Alaska · 283 days ago · 76 km deep · 87 km away
  2. 3.2262 km W of Adak, Alaska · 281 days ago · 77 km deep · 16 km away
  3. 1.6168 km W of Adak, Alaska · 281 days ago · 14 km deep · 88 km away
  4. 2.8277 km W of Adak, Alaska · 281 days ago · 67 km deep · 34 km away
  5. 3.5Rat Islands, Aleutian Islands, Alaska · 278 days ago · 125 km deep · 91 km away
  6. 3.4Rat Islands, Aleutian Islands, Alaska · 277 days ago · 122 km deep · 99 km away
  7. 3.7Rat Islands, Aleutian Islands, Alaska · 276 days ago · 98 km deep · 76 km away
  8. 3.1291 km WSW of Adak, Alaska · 276 days ago · 41 km deep · 59 km away
  9. 3.4Rat Islands, Aleutian Islands, Alaska · 274 days ago · 98 km deep · 80 km away
  10. 1.5250 km W of Adak, Alaska · 271 days ago · 5 km deep · 25 km away
  11. 3.3233 km WSW of Adak, Alaska · 262 days ago · 35 km deep · 82 km away
  12. 2.9233 km W of Adak, Alaska · 262 days ago · 95 km deep · 27 km away
  13. 2.7Rat Islands, Aleutian Islands, Alaska · 258 days ago · 48 km deep · 78 km away
  14. 3.1239 km WSW of Adak, Alaska · 254 days ago · 14 km deep · 91 km away
  15. 2.8233 km WSW of Adak, Alaska · 254 days ago · 18 km deep · 59 km away
  16. 2.3Rat Islands, Aleutian Islands, Alaska · 252 days ago · 5 km deep · 93 km away
  17. 3.5299 km WSW of Adak, Alaska · 250 days ago · 26 km deep · 58 km away
  18. 3.2Rat Islands, Aleutian Islands, Alaska · 250 days ago · 35 km deep · 80 km away
  19. 3.4205 km W of Adak, Alaska · 248 days ago · 94 km deep · 52 km away
  20. 3.0240 km WSW of Adak, Alaska · 244 days ago · 10 km deep · 98 km away
  21. 3.6265 km W of Adak, Alaska · 243 days ago · 80 km deep · 22 km away
  22. 3.9295 km W of Adak, Alaska · 243 days ago · 176 km deep · 71 km away
  23. 3.3283 km WSW of Adak, Alaska · 242 days ago · 35 km deep · 51 km away
  24. 3.0283 km WSW of Adak, Alaska · 240 days ago · 35 km deep · 76 km away
  25. 4.1Rat Islands, Aleutian Islands, Alaska · 240 days ago · 69 km deep · 90 km away
  26. 2.9269 km W of Adak, Alaska · 240 days ago · 108 km deep · 14 km away
  27. 2.8186 km W of Adak, Alaska · 238 days ago · 141 km deep · 69 km away
  28. 3.9Rat Islands, Aleutian Islands, Alaska · 237 days ago · 56 km deep · 79 km away
  29. 4.9Rat Islands, Aleutian Islands, Alaska · 230 days ago · 117 km deep · 90 km away
  30. 3.5Rat Islands, Aleutian Islands, Alaska · 230 days ago · 113 km deep · 92 km away
  31. 3.3Rat Islands, Aleutian Islands, Alaska · 229 days ago · 99 km deep · 53 km away
  32. 2.8Rat Islands, Aleutian Islands, Alaska · 229 days ago · 35 km deep · 80 km away
  33. 2.8223 km WSW of Adak, Alaska · 228 days ago · 60 km deep · 55 km away
  34. 3.2251 km W of Adak, Alaska · 225 days ago · 95 km deep · 8 km away
  35. 4.7225 km W of Adak, Alaska · 225 days ago · 127 km deep · 39 km away

Before

  1. 3.3263 km W of Adak, Alaska · 286 days ago · 193 km deep · 20 km away
  2. 3.3220 km W of Adak, Alaska · 287 days ago · 106 km deep · 36 km away
  3. 2.6261 km W of Adak, Alaska · 287 days ago · 92 km deep · 7 km away
  4. 2.6252 km WSW of Adak, Alaska · 288 days ago · 35 km deep · 75 km away
  5. 2.0Rat Islands, Aleutian Islands, Alaska · 288 days ago · 3 km deep · 91 km away
  6. 2.5213 km WSW of Adak, Alaska · 288 days ago · 24 km deep · 98 km away
  7. 2.9Rat Islands, Aleutian Islands, Alaska · 289 days ago · 10 km deep · 97 km away
  8. 2.9206 km WSW of Adak, Alaska · 289 days ago · 35 km deep · 93 km away
  9. 2.4172 km W of Adak, Alaska · 289 days ago · 130 km deep · 83 km away
  10. 2.5228 km WSW of Adak, Alaska · 289 days ago · 66 km deep · 50 km away
  11. 2.6Rat Islands, Aleutian Islands, Alaska · 290 days ago · 112 km deep · 88 km away
  12. 3.1219 km WSW of Adak, Alaska · 292 days ago · 35 km deep · 87 km away
  13. 3.4Rat Islands, Aleutian Islands, Alaska · 293 days ago · 116 km deep · 96 km away
  14. 5.5Rat Islands, Aleutian Islands, Alaska · 293 days ago · 108 km deep · 98 km away
  15. 1.9269 km W of Adak, Alaska · 294 days ago · 8 km deep · 14 km away
  16. 2.1263 km W of Adak, Alaska · 295 days ago · 11 km deep · 10 km away
  17. 2.4166 km W of Adak, Alaska · 296 days ago · 5 km deep · 91 km away
  18. 1.6263 km W of Adak, Alaska · 296 days ago · 3 km deep · 8 km away
  19. 2.6228 km WSW of Adak, Alaska · 297 days ago · 10 km deep · 92 km away
  20. 1.5261 km W of Adak, Alaska · 297 days ago · 16 km deep · 14 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event av93064179. Read Fri, Oct 2, 2026, 4:41 AM UTC.