Alaska earthquakes

M2.9 earthquake 184 km SW of Nikolski, Alaska

A magnitude 2.9 earthquake struck 184 km SW of Nikolski, Alaska on Mon, Aug 4, 2025, 6:36 AM HADT (15:36 UTC), 41 km (25 mi) below the surface.

A larger quake followed: M5.2 144 km SSW of Nikolski, 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
2025-08-04 15:36:55 UTC
Depth
40.8 km (25.3 mi), shallow
Epicenter
51.794° N, 170.821° 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 · ±0.091 · 16 stations
2.7ML, 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 8.3 km horizontally, 28.8 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
223°, poorly surrounded by stations
Stations used
18

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 14 in the 30 days before it.

After

  1. 2.6170 km WSW of Nikolski, Alaska · 422 days ago · 67 km deep · 66 km away
  2. 2.2155 km WSW of Nikolski, Alaska · 422 days ago · 4 km deep · 91 km away
  3. 3.2139 km WSW of Nikolski, Alaska · 421 days ago · 51 km deep · 68 km away
  4. 2.8182 km SW of Nikolski, Alaska · 421 days ago · 35 km deep · 20 km away
  5. 3.3143 km SSW of Nikolski, Alaska · 421 days ago · 10 km deep · 77 km away
  6. 4.7139 km SSW of Nikolski, Alaska · 414 days ago · 10 km deep · 72 km away
  7. 5.2144 km SSW of Nikolski, Alaska · 414 days ago · 10 km deep · 56 km away
  8. 2.7136 km SSW of Nikolski, Alaska · 414 days ago · 10 km deep · 66 km away
  9. 2.3143 km SSW of Nikolski, Alaska · 414 days ago · 10 km deep · 73 km away
  10. 2.6129 km SSW of Nikolski, Alaska · 414 days ago · 10 km deep · 72 km away
  11. 2.6136 km SSW of Nikolski, Alaska · 413 days ago · 10 km deep · 66 km away
  12. 4.1143 km SSW of Nikolski, Alaska · 412 days ago · 10 km deep · 69 km away
  13. 2.6126 km SW of Nikolski, Alaska · 412 days ago · 26 km deep · 59 km away
  14. 2.6120 km SSW of Nikolski, Alaska · 412 days ago · 23 km deep · 85 km away
  15. 2.9158 km SW of Nikolski, Alaska · 412 days ago · 35 km deep · 32 km away
  16. 2.5136 km SSW of Nikolski, Alaska · 412 days ago · 10 km deep · 66 km away
  17. 2.8137 km SSW of Nikolski, Alaska · 410 days ago · 10 km deep · 71 km away
  18. 2.0118 km SSW of Nikolski, Alaska · 410 days ago · 14 km deep · 86 km away
  19. 2.2130 km SSW of Nikolski, Alaska · 410 days ago · 11 km deep · 84 km away
  20. 4.3163 km SW of Nikolski, Alaska · 403 days ago · 10 km deep · 32 km away
  21. 3.0167 km WSW of Nikolski, Alaska · 403 days ago · 35 km deep · 42 km away
  22. 2.9129 km WSW of Nikolski, Alaska · 403 days ago · 33 km deep · 99 km away
  23. 2.7126 km SW of Nikolski, Alaska · 401 days ago · 35 km deep · 58 km away
  24. 2.3158 km WSW of Nikolski, Alaska · 399 days ago · 45 km deep · 53 km away
  25. 4.1132 km SSW of Nikolski, Alaska · 398 days ago · 17 km deep · 68 km away
  26. 4.2114 km SW of Nikolski, Alaska · 394 days ago · 26 km deep · 73 km away
  27. 4.6100 km SSW of Nikolski, Alaska · 393 days ago · 35 km deep · 100 km away
  28. 3.793 km WSW of Nikolski, Alaska · 391 days ago · 63 km deep · 97 km away
  29. 4.487 km SW of Nikolski, Alaska · 391 days ago · 35 km deep · 99 km away
  30. 4.5185 km SW of Nikolski, Alaska · 383 days ago · 19 km deep · 15 km away
  31. 5.1130 km SSW of Nikolski, Alaska · 381 days ago · 27 km deep · 80 km away

Before

  1. 3.6132 km SW of Nikolski, Alaska · 424 days ago · 45 km deep · 56 km away
  2. 2.199 km SW of Nikolski, Alaska · 430 days ago · 33 km deep · 85 km away
  3. 2.1171 km SSW of Nikolski, Alaska · 431 days ago · 15 km deep · 47 km away
  4. 1.8136 km SSW of Nikolski, Alaska · 431 days ago · 10 km deep · 75 km away
  5. 4.0133 km SW of Nikolski, Alaska · 431 days ago · 46 km deep · 53 km away
  6. 2.7177 km SW of Nikolski, Alaska · 432 days ago · 10 km deep · 8 km away
  7. 2.7114 km SSW of Nikolski, Alaska · 433 days ago · 18 km deep · 86 km away
  8. 2.8144 km SW of Nikolski, Alaska · 438 days ago · 35 km deep · 46 km away
  9. 3.3172 km E of Atka, Alaska · 440 days ago · 125 km deep · 95 km away
  10. 2.5133 km SW of Nikolski, Alaska · 444 days ago · 35 km deep · 56 km away
  11. 2.8130 km SW of Nikolski, Alaska · 449 days ago · 35 km deep · 56 km away
  12. 3.8130 km SW of Nikolski, Alaska · 449 days ago · 35 km deep · 57 km away
  13. 2.7171 km E of Atka, Alaska · 449 days ago · 80 km deep · 93 km away
  14. 2.288 km SW of Nikolski, Alaska · 450 days ago · 35 km deep · 100 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000refa (also filed as ak0259xh8ape). Read Fri, Oct 2, 2026, 9:44 AM UTC.