Skip to content
SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 17:19 UTC on 3 Sept 2026, at a depth of 23 km, according to USGS.

Data: USGS · updated 2026-09-03 20:13 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
23.3 km
Status
Reviewed
Origin time
2026-09-03 17:19:27 UTC
Epicentre
51.999° N, 169.261° 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.

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 Survey2.8 ml23.3 km52.00° N, 169.26° W–Reviewed

How big was it?

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

It released roughly the energy of 239 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 23 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.8 releases about 32× the energy of M1.8, and its waves are about 10× taller on a seismogram. Energy: 239 kg of TNT vs 8 kg of TNT.

Each square is the energy of one M1.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

133 later earthquakes within 30 km; the largest was M5.4 25 days ago. 99 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.363.110
0.682.811
1.243.724
1.392.87
1.445.310
1.633.410
1.792.77
1.953.010
2.062.510
2.102.610
2.823.035
2.923.725
3.035.410
3.344.410
3.562.615
3.622.812
5.282.810
5.342.88
5.383.310
5.562.710
5.583.310
5.893.010
6.052.723
6.102.610
6.192.510
6.582.811
6.632.910
6.633.010
6.702.610
7.072.810
7.942.916
8.172.97
8.313.010
8.473.310
8.512.810
8.523.810
8.662.510
8.773.010
8.793.925
8.992.510
9.042.610
9.082.88
9.343.010
9.523.019
10.222.824
10.253.79
10.362.824
10.902.830
11.323.54
11.862.710
12.152.610
12.302.511
12.882.610
13.532.81
13.802.716
14.102.810
14.622.710
15.212.635
15.412.711
15.672.722
16.103.512
17.073.215
18.302.711
20.822.810
21.344.035
22.242.910
32.693.129
33.643.217
33.953.010
34.402.810
34.992.727
36.982.710
39.832.714
40.652.720
43.132.810
43.602.87
46.923.020
48.684.929
55.792.88
59.053.825
59.122.922
59.842.810
62.492.821
63.742.91
65.982.917
67.192.818
69.663.110
70.143.910
75.922.711
77.352.711
78.362.76
78.552.813
81.143.210
81.992.612
87.932.711
89.462.85
90.963.218
91.762.713
91.922.722
92.982.735
109.523.015
110.893.28
110.952.95
120.613.210
121.132.610
121.552.710
124.792.914
125.743.38
125.822.77
125.973.09
126.132.713
127.052.712
131.212.611
153.182.511
177.573.411
181.032.98
182.072.718
182.172.719
190.862.614
193.093.135
216.953.335
224.452.73
238.592.85
243.362.716
269.542.710
279.392.98
288.442.952
288.692.818
327.872.714
343.803.825
356.003.245
396.633.211
396.692.910
  1. 5.4Nikolski, Alaska09-03 20:21
  2. 5.3Nikolski, Alaska09-03 18:45
  3. 4.9Nikolski, Alaska09-05 18:00
  4. 4.4Nikolski, Alaska09-03 20:40
  5. 4.0Nikolski, Alaska09-04 14:39
  6. 3.9Nikolski, Alaska09-04 02:06
  7. 3.9Nikolski, Alaska09-06 15:28
  8. 3.8Nikolski, Alaska09-04 01:50
  9. 3.8Nikolski, Alaska09-06 04:22
  10. 3.8Nikolski, Alaska09-18 01:07
  11. 3.7Nikolski, Alaska09-03 18:33
  12. 3.7Nikolski, Alaska09-03 20:14
  13. 3.7Nikolski, Alaska09-04 03:34
  14. 3.5Nikolski, Alaska09-04 04:38
  15. 3.5Nikolski, Alaska09-04 09:25
  16. 3.4Nikolski, Alaska09-03 18:57
  17. 3.4Nikolski, Alaska09-11 02:53
  18. 3.3Nikolski, Alaska09-03 22:42
  19. 3.3Nikolski, Alaska09-03 22:54
  20. 3.3Nikolski, Alaska09-04 01:47
  21. 3.3Nikolski, Alaska09-08 23:04
  22. 3.3Nikolski, Alaska09-12 18:16
  23. 3.2Nikolski, Alaska09-04 10:23
  24. 3.2Nikolski, Alaska09-05 02:57
  25. 3.2Nikolski, Alaska09-07 02:28

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 aka2026rlwaom. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rlwaom). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rlwaom-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rlwaom. SeismoAtlas is not an official warning service.