Alaska earthquakes

M2.9 earthquake 175 km SSW of Adak, Alaska

A magnitude 2.9 earthquake struck 175 km SSW of Adak, Alaska on Tue, Aug 26, 2025, 12:43 AM HADT (09:43 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 122 km SW 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
2.9 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-08-26 09:43:33 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.485° N, 177.809° 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
2.9ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.085 · 18 stations
2.6ML, 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 3.6 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.09
Depth from
Operator assigned
Station coverage gap
245°, poorly surrounded by stations
Stations used
30

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 38 in the 30 days before it.

After

  1. 1.9127 km SW of Adak, Alaska · 402 days ago · 26 km deep · 78 km away
  2. 1.7140 km WSW of Adak, Alaska · 402 days ago · 23 km deep · 95 km away
  3. 1.9131 km WSW of Adak, Alaska · 401 days ago · 29 km deep · 92 km away
  4. 2.9101 km SW of Adak, Alaska · 399 days ago · 35 km deep · 85 km away
  5. 2.4249 km SSW of Adak, Alaska · 395 days ago · 12 km deep · 76 km away
  6. 1.895 km SW of Adak, Alaska · 395 days ago · 27 km deep · 87 km away
  7. 3.8110 km SSW of Adak, Alaska · 393 days ago · 8 km deep · 67 km away
  8. 5.5122 km SW of Adak, Alaska · 377 days ago · 30 km deep · 81 km away · felt by 4 · tsunami flag
  9. 3.898 km SW of Adak, Alaska · 375 days ago · 43 km deep · 84 km away
  10. 1.8129 km WSW of Adak, Alaska · 371 days ago · 26 km deep · 94 km away
  11. 2.1117 km SW of Adak, Alaska · 371 days ago · 26 km deep · 82 km away
  12. 3.8103 km S of Adak, Alaska · 369 days ago · 10 km deep · 83 km away
  13. 2.6122 km SW of Adak, Alaska · 350 days ago · 35 km deep · 81 km away

Before

  1. 2.6129 km SW of Adak, Alaska · 404 days ago · 35 km deep · 88 km away
  2. 2.6148 km WSW of Adak, Alaska · 406 days ago · 32 km deep · 95 km away
  3. 2.094 km SW of Adak, Alaska · 406 days ago · 27 km deep · 90 km away
  4. 3.197 km SW of Adak, Alaska · 407 days ago · 12 km deep · 99 km away
  5. 1.9141 km WSW of Adak, Alaska · 408 days ago · 24 km deep · 96 km away
  6. 1.8133 km SW of Adak, Alaska · 409 days ago · 21 km deep · 79 km away
  7. 3.9191 km SW of Adak, Alaska · 411 days ago · 10 km deep · 91 km away
  8. 4.3179 km WSW of Adak, Alaska · 411 days ago · 33 km deep · 97 km away
  9. 1.6136 km SW of Adak, Alaska · 413 days ago · 26 km deep · 79 km away
  10. 1.6139 km SW of Adak, Alaska · 413 days ago · 26 km deep · 80 km away
  11. 2.7193 km SSW of Adak, Alaska · 413 days ago · 9 km deep · 25 km away
  12. 1.9130 km SW of Adak, Alaska · 414 days ago · 25 km deep · 71 km away
  13. 1.7125 km SW of Adak, Alaska · 416 days ago · 22 km deep · 76 km away
  14. 2.7172 km SSW of Adak, Alaska · 417 days ago · 10 km deep · 47 km away
  15. 2.2140 km SW of Adak, Alaska · 417 days ago · 21 km deep · 71 km away
  16. 1.9139 km WSW of Adak, Alaska · 417 days ago · 23 km deep · 94 km away
  17. 2.5106 km SSW of Adak, Alaska · 419 days ago · 10 km deep · 70 km away
  18. 2.4185 km S of Adak, Alaska · 420 days ago · 12 km deep · 95 km away
  19. 2.4169 km SSW of Adak, Alaska · 421 days ago · 12 km deep · 20 km away
  20. 2.1147 km WSW of Adak, Alaska · 422 days ago · 22 km deep · 89 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rlhi (also filed as ak025axrisgn). Read Sat, Oct 3, 2026, 6:47 AM UTC.