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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 04:13 UTC on 4 Sept 2026, at a depth of 30 km, according to USGS.

Data: USGS · updated 2026-09-04 19:53 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
29.5 km
Status
Reviewed
Origin time
2026-09-04 04:13:28 UTC
Epicentre
51.909° N, 169.346° 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 ml29.5 km51.91° N, 169.35° 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 30 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

61 later earthquakes within 30 km; the largest was M4.0 24 days ago. 106 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.423.54
1.252.610
1.402.511
1.982.610
3.722.710
7.402.711
9.922.810
10.444.035
11.342.910
21.793.129
22.743.217
23.053.010
23.502.810
24.092.727
26.082.710
28.922.714
29.752.720
32.232.810
32.702.87
36.013.020
44.892.88
48.153.825
48.222.922
48.942.810
51.592.821
55.082.917
56.292.818
58.763.110
59.243.910
66.452.711
67.462.76
67.652.813
70.243.210
77.032.711
78.562.85
80.063.218
81.022.722
99.993.28
109.713.210
110.652.710
114.843.38
114.922.77
115.073.09
120.312.611
142.282.511
166.673.411
171.172.718
171.272.719
179.962.614
206.053.335
213.552.73
227.692.85
258.642.710
268.492.98
277.542.952
277.792.818
316.972.714
332.903.825
345.103.245
385.733.211
385.792.910
  1. 4.0Nikolski, Alaska09-04 14:39
  2. 3.9Nikolski, Alaska09-06 15:28
  3. 3.8Nikolski, Alaska09-06 04:22
  4. 3.8Nikolski, Alaska09-18 01:07
  5. 3.5Nikolski, Alaska09-04 04:38
  6. 3.4Nikolski, Alaska09-11 02:53
  7. 3.3Nikolski, Alaska09-08 23:04
  8. 3.3Nikolski, Alaska09-12 18:16
  9. 3.2Nikolski, Alaska09-05 02:57
  10. 3.2Nikolski, Alaska09-07 02:28
  11. 3.2Nikolski, Alaska09-07 12:17
  12. 3.2Nikolski, Alaska09-08 08:13
  13. 3.2Nikolski, Alaska09-08 17:55
  14. 3.2Nikolski, Alaska09-18 13:19
  15. 3.2Nikolski, Alaska09-20 05:57
  16. 3.1Nikolski, Alaska09-05 02:00
  17. 3.1Nikolski, Alaska09-06 14:58
  18. 3.0Nikolski, Alaska09-05 03:16
  19. 3.0Nikolski, Alaska09-05 16:14
  20. 3.0Nikolski, Alaska09-08 23:17
  21. 2.9Nikolski, Alaska09-04 15:33
  22. 2.9Nikolski, Alaska09-06 04:26
  23. 2.9Nikolski, Alaska09-06 11:18
  24. 2.9Nikolski, Alaska09-15 08:42
  25. 2.9Nikolski, Alaska09-15 17:45

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 aka2026rmrvtf. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rmrvtf). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rmrvtf-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rmrvtf. SeismoAtlas is not an official warning service.