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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 05:06 UTC on 4 Sept 2026, at a depth of 12 km, according to USGS.

Data: USGS · updated 2026-09-07 05:32 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
11.6 km
Status
Reviewed
Origin time
2026-09-04 05:06:06 UTC
Epicentre
52.258° N, 169.137° 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 6 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, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey2.8 ml11.6 km52.26° N, 169.14° 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 12 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

81 later earthquakes within 30 km; the largest was M4.9 23 days ago. 136 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.082.710
0.522.511
1.762.81
2.022.716
2.322.810
2.842.710
3.212.75
3.432.635
3.632.711
3.892.722
4.323.512
5.293.215
6.522.711
6.952.635
9.042.810
9.564.035
9.773.135
12.392.625
20.913.129
21.863.217
22.173.010
22.622.810
23.062.535
23.212.727
28.052.714
28.872.720
31.352.810
33.733.07
35.062.75
35.143.020
36.904.929
37.092.820
44.012.88
48.072.810
50.722.821
51.962.91
54.202.917
58.373.910
64.142.711
65.572.711
66.772.813
69.373.210
70.212.612
76.152.711
79.992.713
80.152.722
81.202.735
97.753.015
99.123.28
99.182.95
108.833.210
108.903.410
109.352.610
109.772.710
113.012.914
113.944.046
113.973.38
114.042.77
114.203.09
114.362.713
115.282.712
115.293.650
119.432.611
149.282.718
155.232.735
165.793.411
169.252.98
179.082.614
181.313.135
205.173.335
231.582.716
231.942.935
267.612.98
276.662.952
316.102.714
332.033.825
367.634.041
384.853.211
384.912.910
394.132.710
544.424.035
  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 us7000tee4. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000tee4). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tee4-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tee4. SeismoAtlas is not an official warning service.