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SeismoAtlas

M2.5 earthquake – Nikolski, Alaska

A magnitude 2.5 earthquake struck in the Nikolski, Alaska region at 15:52 UTC on 3 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-28 14:10 UTC · reviewed

Magnitude
2.5micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-03 15:52:37 UTC
Epicentre
52.076° N, 169.073° 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, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey2.5 ml10 km52.08° N, 169.07° W–Reviewed

How big was it?

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

It released roughly the energy of 85 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.

M2.5 releases about 32× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 85 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

148 later earthquakes within 30 km; the largest was M5.4 25 days ago. 88 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.202.717
0.252.920
0.262.610
0.314.835
0.392.710
0.603.67
0.902.710
0.993.010
1.022.810
1.452.823
1.803.110
2.122.811
2.693.724
2.792.610
2.832.87
2.885.310
3.073.410
3.242.77
3.403.010
3.502.510
3.552.610
4.273.035
4.373.725
4.485.410
4.794.410
5.012.615
5.072.812
6.732.810
6.792.88
6.833.310
7.033.310
7.333.010
7.502.723
7.552.610
7.642.510
8.032.811
8.072.910
8.083.010
8.152.610
9.382.916
9.622.97
9.763.010
9.923.310
9.962.810
9.973.810
10.112.510
10.223.010
10.243.925
10.442.510
10.482.610
10.532.88
10.793.010
10.973.019
11.662.824
11.703.79
11.812.824
12.352.830
12.773.54
13.222.812
13.312.710
13.602.610
13.752.511
14.332.610
14.982.81
15.242.716
15.552.810
16.062.710
16.432.75
16.662.635
16.852.711
17.122.722
17.553.512
18.523.215
19.752.711
22.272.810
22.794.035
23.682.910
34.133.129
35.083.217
35.403.010
35.842.810
36.442.727
38.422.710
41.272.714
42.102.720
44.582.810
45.052.87
46.953.07
48.282.75
48.363.020
50.134.929
50.322.820
57.242.88
60.503.825
60.562.922
61.292.810
63.942.821
65.182.91
67.432.917
68.632.818
71.113.110
71.593.910
77.362.711
78.802.711
79.812.76
80.002.813
82.593.210
83.442.612
89.372.711
92.413.218
93.212.713
93.372.722
94.432.735
110.973.015
112.343.28
112.402.95
122.053.210
122.582.610
123.002.710
126.242.914
127.193.38
127.272.77
127.423.09
127.582.713
128.502.712
132.652.611
154.632.511
162.502.718
166.722.622
168.462.735
179.023.411
182.482.98
183.522.718
183.622.719
192.302.614
218.403.335
240.042.85
244.812.716
245.172.935
270.992.710
280.842.98
289.892.952
290.142.818
329.322.714
345.253.825
398.083.211
398.142.910
407.362.710
  1. 5.4Nikolski, Alaska09-03 20:21
  2. 5.3Nikolski, Alaska09-03 18:45
  3. 4.9Nikolski, Alaska09-05 18:00
  4. 4.8Nikolski, Alaska09-03 16:11
  5. 4.4Nikolski, Alaska09-03 20:40
  6. 4.0Nikolski, Alaska09-04 14:39
  7. 3.9Nikolski, Alaska09-04 02:06
  8. 3.9Nikolski, Alaska09-06 15:28
  9. 3.8Nikolski, Alaska09-04 01:50
  10. 3.8Nikolski, Alaska09-06 04:22
  11. 3.8Nikolski, Alaska09-18 01:07
  12. 3.7Nikolski, Alaska09-03 18:33
  13. 3.7Nikolski, Alaska09-03 20:14
  14. 3.7Nikolski, Alaska09-04 03:34
  15. 3.6Nikolski, Alaska09-03 16:28
  16. 3.5Nikolski, Alaska09-04 04:38
  17. 3.5Nikolski, Alaska09-04 09:25
  18. 3.4Nikolski, Alaska09-03 18:57
  19. 3.4Nikolski, Alaska09-11 02:53
  20. 3.3Nikolski, Alaska09-03 22:42
  21. 3.3Nikolski, Alaska09-03 22:54
  22. 3.3Nikolski, Alaska09-04 01:47
  23. 3.3Nikolski, Alaska09-08 23:04
  24. 3.3Nikolski, Alaska09-12 18:16
  25. 3.2Nikolski, Alaska09-04 10:23

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 us7000te3p. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000te3p). Cite as: SeismoAtlas, “M2.5 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000te3p-m2-5-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000te3p. SeismoAtlas is not an official warning service.