Alaska earthquakes

M3.9 earthquake 79 km NE of Adak, Alaska

A magnitude 3.9 earthquake struck 79 km NE of Adak, Alaska on Wed, Oct 1, 2025, 1:40 PM HADT (22:40 UTC), 222 km (138 mi) below the surface.

A larger quake followed: M4.9 47 km SE 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
3.9 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-10-01 22:40:28 UTC
Depth
222.4 km (138.2 mi), intermediate-depth
Epicenter
52.376° N, 175.802° 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
3.9mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.093 · 31 stations
3.4ML, local (Richter)Alaska Earthquake CenterPreliminary

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 12.3 km horizontally, 6.3 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
100°
Stations used
69

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 13 in the 30 days before it.

After

  1. 4.4100 km SW of Atka, Alaska · 361 days ago · 35 km deep · 97 km away
  2. 1.989 km ESE of Adak, Alaska · 351 days ago · 19 km deep · 97 km away
  3. 1.618 km W of Adak, Alaska · 349 days ago · 3 km deep · 95 km away
  4. 1.810 km NE of Adak, Alaska · 345 days ago · 28 km deep · 69 km away
  5. 4.947 km SE of Adak, Alaska · 344 days ago · 57 km deep · 91 km away · felt by 1
  6. 3.679 km WSW of Atka, Alaska · 338 days ago · 60 km deep · 73 km away
  7. 4.098 km ESE of Adak, Alaska · 329 days ago · 41 km deep · 95 km away
  8. 3.010 km S of Adak, Alaska · 325 days ago · 67 km deep · 86 km away
  9. 2.015 km SSE of Adak, Alaska · 319 days ago · 59 km deep · 87 km away
  10. 3.198 km ESE of Adak, Alaska · 319 days ago · 35 km deep · 95 km away
  11. 1.639 km NE of Adak, Alaska · 318 days ago · 9 km deep · 41 km away
  12. 2.974 km E of Adak, Alaska · 318 days ago · 27 km deep · 70 km away
  13. 2.252 km NE of Adak, Alaska · 318 days ago · 186 km deep · 29 km away
  14. 2.371 km E of Adak, Alaska · 318 days ago · 70 km deep · 68 km away
  15. 2.746 km ENE of Adak, Alaska · 314 days ago · 132 km deep · 43 km away
  16. 3.743 km N of Adak, Alaska · 313 days ago · 223 km deep · 58 km away
  17. 3.783 km WSW of Atka, Alaska · 313 days ago · 56 km deep · 65 km away
  18. 2.353 km SE of Adak, Alaska · 313 days ago · 38 km deep · 91 km away
  19. 2.660 km SE of Adak, Alaska · 311 days ago · 35 km deep · 91 km away
  20. 2.864 km SE of Adak, Alaska · 311 days ago · 35 km deep · 98 km away
  21. 1.835 km ESE of Adak, Alaska · 310 days ago · 66 km deep · 78 km away
  22. 2.831 km NW of Adak, Alaska · 309 days ago · 123 km deep · 88 km away

Before

  1. 3.983 km SW of Atka, Alaska · 371 days ago · 35 km deep · 89 km away
  2. 3.192 km WNW of Atka, Alaska · 372 days ago · 215 km deep · 25 km away
  3. 2.783 km W of Atka, Alaska · 372 days ago · 225 km deep · 28 km away
  4. 1.622 km E of Adak, Alaska · 381 days ago · 6 km deep · 63 km away
  5. 4.032 km NNE of Adak, Alaska · 385 days ago · 126 km deep · 49 km away · felt by 2
  6. 4.178 km WNW of Atka, Alaska · 386 days ago · 219 km deep · 40 km away
  7. 1.518 km SW of Atka, Alaska · 388 days ago · 9 km deep · 100 km away
  8. 1.635 km NE of Adak, Alaska · 390 days ago · 19 km deep · 45 km away
  9. 3.962 km NW of Atka, Alaska · 392 days ago · 209 km deep · 77 km away
  10. 2.582 km ESE of Adak, Alaska · 396 days ago · 50 km deep · 88 km away
  11. 1.585 km WSW of Atka, Alaska · 396 days ago · 17 km deep · 47 km away
  12. 1.953 km SE of Adak, Alaska · 397 days ago · 56 km deep · 95 km away
  13. 3.340 km NNW of Adak, Alaska · 397 days ago · 173 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000re4g (also filed as ak025clil9od). Read Sun, Oct 4, 2026, 8:57 AM UTC.