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SeismoAtlas

M2.9 earthquake – Nikolski, Alaska

A magnitude 2.9 earthquake struck in the Nikolski, Alaska region at 01:29 UTC on 4 Sept 2026, at a depth of 7 km, according to USGS.

Data: USGS · updated 2026-09-04 05:55 UTC · reviewed

Magnitude
2.9micro
local magnitude (Richter) (ml)
Depth
7 km
Status
Reviewed
Origin time
2026-09-04 01:29:34 UTC
Epicentre
51.988° N, 169.125° W

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 12 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 · AK, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey2.9 ml7 km51.99° N, 169.13° W–Reviewed

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 7 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

107 later earthquakes within 30 km; the largest was M4.9 68 days ago. 120 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.143.010
0.303.310
0.342.810
0.353.810
0.492.510
0.603.010
0.623.925
0.832.510
0.872.610
0.912.88
1.172.89
1.362.710
2.052.910
2.093.58
2.732.830
3.153.510
3.692.710
3.982.610
4.132.511
4.712.610
5.372.81
5.632.716
5.932.810
6.452.710
7.042.635
7.242.711
10.132.711
12.652.810
13.174.035
14.072.910
24.523.129
25.473.217
25.783.010
26.232.810
26.822.727
28.812.710
31.662.714
32.482.720
34.962.810
35.432.87
38.752.910
40.514.929
47.622.88
50.883.825
50.952.922
51.682.810
54.322.821
55.572.710
57.812.917
59.022.818
61.493.110
61.983.910
67.752.711
69.182.711
70.192.76
70.382.813
72.973.210
73.822.612
79.762.711
81.292.85
82.793.110
83.602.713
83.752.722
84.812.735
102.722.910
102.792.710
112.443.210
112.962.610
113.382.710
117.573.110
117.652.77
117.812.710
117.962.713
118.892.712
123.042.611
145.012.511
157.112.622
169.403.310
172.862.810
173.912.718
174.012.719
182.692.614
208.783.335
216.282.59
230.422.85
235.192.716
261.372.710
271.222.710
280.272.952
280.522.818
319.712.714
335.633.810
388.462.923
388.522.910
392.773.010
444.712.55
451.523.114
451.692.910
453.162.714
472.753.334
599.602.78
600.152.87
618.302.63
627.262.810
627.442.810
634.732.510
650.143.110
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 3.9Nikolski, Alaska09-04 02:06
  4. 3.9Nikolski, Alaska09-06 15:28
  5. 3.8Nikolski, Alaska09-04 01:50
  6. 3.8Nikolski, Alaska09-06 04:22
  7. 3.8Nikolski, Alaska09-18 01:07
  8. 3.5Nikolski, Alaska09-04 03:34
  9. 3.5Nikolski, Alaska09-04 04:38
  10. 3.3Nikolski, Alaska09-04 01:47
  11. 3.3Nikolski, Alaska09-11 02:53
  12. 3.3Nikolski, Alaska09-12 18:16
  13. 3.3Nikolski, Alaska09-23 18:14
  14. 3.2Nikolski, Alaska09-05 02:57
  15. 3.2Nikolski, Alaska09-07 02:28
  16. 3.2Nikolski, Alaska09-08 17:55
  17. 3.1Nikolski, Alaska09-05 02:00
  18. 3.1Nikolski, Alaska09-06 14:58
  19. 3.1Nikolski, Alaska09-07 12:17
  20. 3.1Nikolski, Alaska09-08 23:04
  21. 3.1Nikolski, Alaska09-22 21:00
  22. 3.1Nikolski, Alaska10-01 03:38
  23. 3.0Nikolski, Alaska09-04 01:37
  24. 3.0Nikolski, Alaska09-04 02:05
  25. 3.0Nikolski, Alaska09-05 03:16

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id aka2026rmmjmj. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rmmjmj). Cite as: SeismoAtlas, “M2.9 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rmmjmj-m2-9-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rmmjmj. SeismoAtlas is not an official warning service.