Alaska earthquakes

M2.8 earthquake 221 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 221 km W of Adak, Alaska on Thu, Oct 16, 2025, 10:09 PM HADT (07:09 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.3 266 km W 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, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-10-17 07:09:45 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
51.622° N, 179.813° W
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
2.8ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.115 · 10 stations
2.73ML, local (Richter)AVFinal · ±0.200591055870578 · 9 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 1.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
168°
Stations used
11

Nearby

Within 100 km, magnitude 1.5 and up: 39 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 2.8206 km W of Adak, Alaska · 349 days ago · 96 km deep · 16 km away
  2. 2.4126 km WSW of Adak, Alaska · 341 days ago · 9 km deep · 96 km away
  3. 2.7149 km WSW of Adak, Alaska · 341 days ago · 10 km deep · 86 km away
  4. 1.9143 km W of Adak, Alaska · 339 days ago · 18 km deep · 78 km away
  5. 1.5163 km W of Adak, Alaska · 335 days ago · 6 km deep · 59 km away
  6. 3.7144 km WSW of Adak, Alaska · 323 days ago · 35 km deep · 99 km away
  7. 2.8194 km WSW of Adak, Alaska · 323 days ago · 35 km deep · 66 km away
  8. 2.9157 km WSW of Adak, Alaska · 318 days ago · 8 km deep · 90 km away
  9. 2.6231 km WSW of Adak, Alaska · 316 days ago · 14 km deep · 56 km away
  10. 2.8Rat Islands, Aleutian Islands, Alaska · 316 days ago · 12 km deep · 99 km away
  11. 1.8137 km WSW of Adak, Alaska · 314 days ago · 14 km deep · 84 km away
  12. 3.1285 km W of Adak, Alaska · 314 days ago · 120 km deep · 73 km away
  13. 2.6177 km W of Adak, Alaska · 314 days ago · 239 km deep · 47 km away
  14. 3.4246 km WSW of Adak, Alaska · 313 days ago · 47 km deep · 33 km away
  15. 2.9185 km WSW of Adak, Alaska · 310 days ago · 77 km deep · 46 km away
  16. 2.5256 km WSW of Adak, Alaska · 310 days ago · 67 km deep · 37 km away
  17. 2.7276 km W of Adak, Alaska · 310 days ago · 63 km deep · 55 km away
  18. 3.4213 km WSW of Adak, Alaska · 310 days ago · 18 km deep · 89 km away
  19. 2.9223 km WSW of Adak, Alaska · 309 days ago · 10 km deep · 50 km away
  20. 3.7259 km WSW of Adak, Alaska · 307 days ago · 54 km deep · 51 km away
  21. 3.7256 km W of Adak, Alaska · 305 days ago · 133 km deep · 61 km away
  22. 4.2199 km WSW of Adak, Alaska · 303 days ago · 13 km deep · 89 km away
  23. 2.6154 km WSW of Adak, Alaska · 301 days ago · 59 km deep · 82 km away
  24. 2.1273 km W of Adak, Alaska · 299 days ago · 12 km deep · 59 km away
  25. 2.7251 km WSW of Adak, Alaska · 299 days ago · 6 km deep · 72 km away
  26. 3.2269 km WSW of Adak, Alaska · 299 days ago · 52 km deep · 54 km away
  27. 4.3266 km W of Adak, Alaska · 299 days ago · 171 km deep · 76 km away
  28. 1.8261 km W of Adak, Alaska · 298 days ago · 4 km deep · 53 km away
  29. 2.1252 km W of Adak, Alaska · 298 days ago · 4 km deep · 45 km away
  30. 2.0133 km WSW of Adak, Alaska · 298 days ago · 12 km deep · 96 km away
  31. 1.5261 km W of Adak, Alaska · 297 days ago · 16 km deep · 53 km away
  32. 2.6228 km WSW of Adak, Alaska · 297 days ago · 10 km deep · 61 km away
  33. 1.6263 km W of Adak, Alaska · 296 days ago · 3 km deep · 48 km away
  34. 2.4166 km W of Adak, Alaska · 296 days ago · 5 km deep · 55 km away
  35. 3.1165 km WSW of Adak, Alaska · 296 days ago · 31 km deep · 84 km away
  36. 2.1263 km W of Adak, Alaska · 295 days ago · 11 km deep · 51 km away
  37. 1.9269 km W of Adak, Alaska · 295 days ago · 8 km deep · 55 km away
  38. 3.1219 km WSW of Adak, Alaska · 292 days ago · 35 km deep · 53 km away
  39. 3.1125 km W of Adak, Alaska · 291 days ago · 129 km deep · 96 km away

Before

  1. 2.6144 km WSW of Adak, Alaska · 352 days ago · 80 km deep · 77 km away
  2. 1.9259 km W of Adak, Alaska · 354 days ago · 7 km deep · 57 km away
  3. 1.7260 km W of Adak, Alaska · 355 days ago · 8 km deep · 53 km away
  4. 3.4246 km WSW of Adak, Alaska · 356 days ago · 35 km deep · 78 km away
  5. 4.5240 km WSW of Adak, Alaska · 356 days ago · 35 km deep · 67 km away
  6. 3.8253 km W of Adak, Alaska · 362 days ago · 173 km deep · 67 km away
  7. 4.2200 km W of Adak, Alaska · 362 days ago · 79 km deep · 22 km away
  8. 3.2236 km WSW of Adak, Alaska · 363 days ago · 11 km deep · 58 km away
  9. 1.9258 km W of Adak, Alaska · 367 days ago · 9 km deep · 50 km away
  10. 2.2257 km W of Adak, Alaska · 369 days ago · 12 km deep · 51 km away
  11. 1.9253 km W of Adak, Alaska · 369 days ago · 3 km deep · 44 km away
  12. 2.6225 km W of Adak, Alaska · 370 days ago · 84 km deep · 9 km away
  13. 2.6171 km W of Adak, Alaska · 371 days ago · 88 km deep · 50 km away
  14. 2.0264 km W of Adak, Alaska · 371 days ago · 4 km deep · 50 km away
  15. 2.1164 km WSW of Adak, Alaska · 372 days ago · 16 km deep · 59 km away
  16. 1.5151 km W of Adak, Alaska · 372 days ago · 14 km deep · 70 km away
  17. 2.0131 km WSW of Adak, Alaska · 376 days ago · 14 km deep · 90 km away
  18. 1.9159 km WSW of Adak, Alaska · 377 days ago · 30 km deep · 74 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ri06 (also filed as av93828726). Read Fri, Oct 2, 2026, 11:52 AM UTC.