Alaska earthquakes

M3.3 earthquake 263 km W of Adak, Alaska

A magnitude 3.3 earthquake struck 263 km W of Adak, Alaska on Sun, Dec 21, 2025, 2:45 AM GMT+12 (14:45 UTC), 193 km (120 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
3.3 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-12-20 14:45:34 UTC
Depth
192.9 km (119.8 mi), intermediate-depth
Epicenter
51.955° N, 179.544° E
Region
Alaska
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
3.3ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.085 · 18 stations
3.2ML, local (Richter)Alaska Earthquake CenterReviewed · ±0.4 · 18 stations

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 11.8 km horizontally, 8.1 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
111°
Stations used
20

Nearby

Within 100 km, magnitude 1.5 and up: 30 in the 60 days after this one and 27 in the 30 days before it.

After

  1. 1.6255 km W of Adak, Alaska · 285 days ago · 4 km deep · 20 km away
  2. 3.2262 km W of Adak, Alaska · 281 days ago · 77 km deep · 34 km away
  3. 1.6168 km W of Adak, Alaska · 281 days ago · 14 km deep · 99 km away
  4. 2.8277 km W of Adak, Alaska · 281 days ago · 67 km deep · 48 km away
  5. 3.5Rat Islands, Aleutian Islands, Alaska · 278 days ago · 125 km deep · 85 km away
  6. 3.4Rat Islands, Aleutian Islands, Alaska · 277 days ago · 122 km deep · 92 km away
  7. 3.7Rat Islands, Aleutian Islands, Alaska · 276 days ago · 98 km deep · 67 km away
  8. 3.1291 km WSW of Adak, Alaska · 276 days ago · 41 km deep · 73 km away
  9. 3.4Rat Islands, Aleutian Islands, Alaska · 274 days ago · 98 km deep · 73 km away
  10. 1.5250 km W of Adak, Alaska · 271 days ago · 5 km deep · 14 km away
  11. 2.9233 km W of Adak, Alaska · 262 days ago · 95 km deep · 44 km away
  12. 2.7Rat Islands, Aleutian Islands, Alaska · 258 days ago · 48 km deep · 85 km away
  13. 2.8233 km WSW of Adak, Alaska · 254 days ago · 18 km deep · 78 km away
  14. 2.3Rat Islands, Aleutian Islands, Alaska · 253 days ago · 5 km deep · 84 km away
  15. 3.5299 km WSW of Adak, Alaska · 250 days ago · 26 km deep · 69 km away
  16. 3.2Rat Islands, Aleutian Islands, Alaska · 250 days ago · 35 km deep · 92 km away
  17. 3.4205 km W of Adak, Alaska · 248 days ago · 94 km deep · 65 km away
  18. 3.6265 km W of Adak, Alaska · 244 days ago · 80 km deep · 38 km away
  19. 3.9295 km W of Adak, Alaska · 243 days ago · 176 km deep · 52 km away
  20. 3.3283 km WSW of Adak, Alaska · 242 days ago · 35 km deep · 66 km away
  21. 3.0283 km WSW of Adak, Alaska · 240 days ago · 35 km deep · 93 km away
  22. 4.1Rat Islands, Aleutian Islands, Alaska · 240 days ago · 69 km deep · 90 km away
  23. 2.9269 km W of Adak, Alaska · 240 days ago · 108 km deep · 20 km away
  24. 2.8186 km W of Adak, Alaska · 238 days ago · 141 km deep · 77 km away
  25. 3.9Rat Islands, Aleutian Islands, Alaska · 237 days ago · 56 km deep · 80 km away
  26. 4.9Rat Islands, Aleutian Islands, Alaska · 230 days ago · 117 km deep · 79 km away
  27. 3.5Rat Islands, Aleutian Islands, Alaska · 230 days ago · 113 km deep · 85 km away
  28. 3.3Rat Islands, Aleutian Islands, Alaska · 229 days ago · 99 km deep · 53 km away
  29. 2.8Rat Islands, Aleutian Islands, Alaska · 229 days ago · 35 km deep · 87 km away
  30. 2.8223 km WSW of Adak, Alaska · 228 days ago · 60 km deep · 74 km away

Before

  1. 3.3220 km W of Adak, Alaska · 287 days ago · 106 km deep · 49 km away
  2. 2.6261 km W of Adak, Alaska · 287 days ago · 92 km deep · 21 km away
  3. 2.6252 km WSW of Adak, Alaska · 288 days ago · 35 km deep · 95 km away
  4. 2.0Rat Islands, Aleutian Islands, Alaska · 288 days ago · 3 km deep · 81 km away
  5. 2.4172 km W of Adak, Alaska · 289 days ago · 130 km deep · 93 km away
  6. 2.5228 km WSW of Adak, Alaska · 290 days ago · 66 km deep · 69 km away
  7. 2.6Rat Islands, Aleutian Islands, Alaska · 291 days ago · 112 km deep · 80 km away
  8. 3.4Rat Islands, Aleutian Islands, Alaska · 293 days ago · 116 km deep · 91 km away
  9. 5.5Rat Islands, Aleutian Islands, Alaska · 293 days ago · 108 km deep · 84 km away
  10. 1.9269 km W of Adak, Alaska · 294 days ago · 8 km deep · 16 km away
  11. 2.1263 km W of Adak, Alaska · 295 days ago · 11 km deep · 14 km away
  12. 1.6263 km W of Adak, Alaska · 296 days ago · 3 km deep · 17 km away
  13. 1.5261 km W of Adak, Alaska · 297 days ago · 16 km deep · 6 km away
  14. 2.1252 km W of Adak, Alaska · 298 days ago · 4 km deep · 13 km away
  15. 1.8261 km W of Adak, Alaska · 298 days ago · 4 km deep · 6 km away
  16. 4.3266 km W of Adak, Alaska · 299 days ago · 171 km deep · 24 km away
  17. 3.2269 km WSW of Adak, Alaska · 299 days ago · 52 km deep · 71 km away
  18. 2.1273 km W of Adak, Alaska · 299 days ago · 12 km deep · 16 km away
  19. 3.7256 km W of Adak, Alaska · 305 days ago · 133 km deep · 13 km away
  20. 3.7259 km WSW of Adak, Alaska · 307 days ago · 54 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000s9nr (also filed as ak2025yzcrtr). Read Fri, Oct 2, 2026, 9:55 AM UTC.