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SeismoAtlas

M2.9 earthquake – Nikolski, Alaska

A magnitude 2.9 earthquake struck in the Nikolski, Alaska region at 03:32 UTC on 4 Sept 2026, at a depth of 10 km, according to USGS.

revised from M2.8

Data: USGS · updated 2026-09-30 22:14 UTC · reviewed

Magnitude
2.9micro
local magnitude (Richter) (ml)
revised from 2.8
Depth
10 km
Status
Reviewed
Origin time
2026-09-04 03:32:29 UTC
Epicentre
52.037° N, 169.199° W

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Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
No towns within 400 km. This is a remote area.

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 10 km.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey2.9 mlwas 2.810 km52.04° N, 169.20° W–Reviewed · 1 revision

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How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 338 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.9 releases about 32× the energy of M1.9, and its waves are about 10× taller on a seismogram. Energy: 338 kg of TNT vs 11 kg of TNT.

Each square is the energy of one M1.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

96 later earthquakes within 30 km; the largest was M4.9 25 days ago. 147 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.9

96 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.043.58
0.142.735
0.682.830
1.113.54
1.562.812
1.642.710
1.932.610
2.082.511
2.662.610
3.322.81
3.582.716
3.882.810
4.402.710
4.992.635
5.192.711
5.452.722
5.883.512
6.853.215
8.082.711
10.612.810
11.124.035
12.022.910
22.473.129
23.423.217
23.733.010
24.182.810
24.772.727
26.762.710
29.612.714
30.432.720
32.912.810
33.382.87
35.293.035
36.622.75
36.703.020
38.464.929
38.652.820
45.572.88
48.833.825
48.902.922
49.632.810
52.282.821
53.522.710
55.762.917
56.972.818
59.443.110
59.933.910
65.702.711
67.132.711
68.142.76
68.332.813
70.933.210
71.772.612
77.712.711
79.242.85
80.743.110
81.552.713
81.712.722
82.762.735
99.313.210
100.682.910
100.742.710
110.393.210
110.912.610
111.332.710
114.572.840
115.533.110
115.602.77
115.922.713
116.842.712
116.853.743
120.992.611
142.962.511
150.842.718
156.792.735
167.353.411
170.812.98
171.862.718
171.962.719
180.642.614
182.873.135
206.733.335
214.232.73
228.372.85
233.142.716
233.502.935
259.322.710
269.172.98
278.222.952
278.472.818
317.662.714
333.593.825
369.194.041
386.413.211
386.472.910
595.342.521
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 4.0Nikolski, Alaska09-19 12:44
  4. 3.9Nikolski, Alaska09-06 15:28
  5. 3.8Nikolski, Alaska09-06 04:22
  6. 3.8Nikolski, Alaska09-18 01:07
  7. 3.7Nikolski, Alaska09-09 00:23
  8. 3.5Nikolski, Alaska09-04 03:34
  9. 3.5Nikolski, Alaska09-04 04:38
  10. 3.5Nikolski, Alaska09-04 09:25
  11. 3.4Nikolski, Alaska09-11 02:53
  12. 3.3Nikolski, Alaska09-12 18:16
  13. 3.2Nikolski, Alaska09-04 10:23
  14. 3.2Nikolski, Alaska09-05 02:57
  15. 3.2Nikolski, Alaska09-07 02:28
  16. 3.2Nikolski, Alaska09-08 06:50
  17. 3.2Nikolski, Alaska09-08 17:55
  18. 3.2Nikolski, Alaska09-20 05:57
  19. 3.1Nikolski, Alaska09-05 02:00
  20. 3.1Nikolski, Alaska09-06 14:58
  21. 3.1Nikolski, Alaska09-07 12:17
  22. 3.1Nikolski, Alaska09-08 23:04
  23. 3.1Nikolski, Alaska09-11 18:24
  24. 3.0Nikolski, Alaska09-05 03:16
  25. 3.0Nikolski, Alaska09-05 14:49

Did you feel it?

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Reports on SeismoAtlas

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Event id aka2026rmqmge. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000tedh). Cite as: SeismoAtlas, “M2.9 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rmqmge-m2-9-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rmqmge. SeismoAtlas is not an official warning service.