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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 03:41 UTC on 4 Sept 2026, at a depth of 24 km, according to USGS.

Data: USGS · updated 2026-09-04 19:37 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
23.5 km
Status
Reviewed
Origin time
2026-09-04 03:41:05 UTC
Epicentre
52.264° N, 169.215° 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 ml23.5 km52.26° N, 169.22° 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 24 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

83 later earthquakes within 30 km; the largest was M4.9 23 days ago. 138 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.422.812
1.502.710
1.792.610
1.942.511
3.172.81
3.432.716
3.742.810
4.262.710
4.622.75
4.852.635
5.052.711
5.312.722
5.743.512
6.713.215
7.942.711
8.362.635
10.462.810
10.984.035
11.193.135
13.802.625
22.333.129
23.273.217
23.593.010
24.042.810
24.482.535
24.632.727
26.622.710
29.462.714
30.292.720
32.772.810
35.153.07
36.482.75
36.553.020
38.324.929
38.512.820
45.432.88
48.762.922
49.482.810
52.132.821
53.382.91
55.622.917
59.783.910
65.552.711
66.992.711
68.192.813
70.783.210
71.632.612
77.572.711
81.402.713
81.562.722
82.622.735
99.163.015
100.533.28
100.592.95
110.253.210
110.323.410
110.772.610
111.192.710
114.432.914
115.364.046
115.383.38
115.462.77
115.613.09
115.772.713
116.692.712
116.713.650
156.652.735
167.213.411
170.672.98
180.502.614
182.733.135
206.593.335
211.582.539
233.002.716
233.362.935
269.032.98
278.082.952
317.512.714
333.443.825
369.054.041
386.273.211
386.332.910
545.844.035
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 4.0Nikolski, Alaska09-08 23:02
  4. 4.0Nikolski, Alaska09-19 12:44
  5. 4.0Fox Islands, Aleutian Islands09-26 21:31
  6. 3.9Nikolski, Alaska09-06 15:28
  7. 3.8Nikolski, Alaska09-18 01:07
  8. 3.6Nikolski, Alaska09-09 00:23
  9. 3.5Nikolski, Alaska09-04 09:25
  10. 3.4Nikolski, Alaska09-08 18:00
  11. 3.4Nikolski, Alaska09-11 02:53
  12. 3.3Nikolski, Alaska09-08 23:04
  13. 3.3Nikolski, Alaska09-12 18:16
  14. 3.2Nikolski, Alaska09-04 10:23
  15. 3.2Nikolski, Alaska09-05 02:57
  16. 3.2Nikolski, Alaska09-07 02:28
  17. 3.2Nikolski, Alaska09-08 08:13
  18. 3.2Nikolski, Alaska09-08 17:55
  19. 3.2Nikolski, Alaska09-20 05:57
  20. 3.1Nikolski, Alaska09-04 14:52
  21. 3.1Nikolski, Alaska09-05 02:00
  22. 3.1Nikolski, Alaska09-11 18:24
  23. 3.0Nikolski, Alaska09-05 03:16
  24. 3.0Nikolski, Alaska09-05 14:49
  25. 3.0Nikolski, Alaska09-05 16:14

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 aka2026rmqtkk. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rmqtkk). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rmqtkk-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rmqtkk. SeismoAtlas is not an official warning service.