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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 03:43 UTC on 5 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-20 01:48 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-05 03:43:19 UTC
Epicentre
52.088° N, 169.297° 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 8 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 ml10 km52.09° N, 169.30° 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 10 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

89 later earthquakes within 30 km; the largest was M4.9 68 days ago. 178 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.442.535
0.592.727
2.582.710
5.432.714
6.252.720
8.732.810
9.202.87
11.113.035
12.442.75
12.522.910
14.284.929
14.472.820
21.392.88
24.653.825
24.722.922
25.452.810
28.102.821
29.342.710
31.582.917
32.792.818
35.263.110
35.753.910
41.522.711
42.952.711
43.962.76
44.152.813
46.753.210
47.592.612
53.532.711
55.062.85
56.563.110
57.372.713
57.522.722
58.582.735
75.133.210
76.502.910
76.562.710
86.213.210
86.283.410
86.732.610
87.152.710
90.392.810
91.324.035
91.343.110
91.422.77
91.582.710
91.742.713
92.662.712
92.673.740
96.812.611
118.782.511
132.612.735
143.173.310
146.632.810
147.682.718
147.782.719
156.462.614
158.693.135
182.553.335
187.542.539
190.052.59
204.192.85
208.962.716
209.322.935
235.142.710
244.992.710
254.042.952
254.292.818
293.482.714
309.413.810
321.603.245
345.014.038
362.232.923
362.292.910
366.543.010
418.492.55
425.293.114
425.462.910
426.932.714
446.523.334
521.804.035
571.162.521
573.372.78
573.922.87
592.072.63
601.032.810
601.222.810
608.502.510
623.913.110
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-08 23:02
  3. 4.0Nikolski, Alaska09-19 12:44
  4. 4.0Fox Islands, Aleutian Islands09-26 21:31
  5. 3.9Nikolski, Alaska09-06 15:28
  6. 3.8Nikolski, Alaska09-06 04:22
  7. 3.8Nikolski, Alaska09-18 01:07
  8. 3.7Nikolski, Alaska09-09 00:23
  9. 3.4Nikolski, Alaska09-08 18:00
  10. 3.3Nikolski, Alaska09-11 02:53
  11. 3.3Nikolski, Alaska09-12 18:16
  12. 3.3Nikolski, Alaska09-23 18:14
  13. 3.2Nikolski, Alaska09-07 02:28
  14. 3.2Nikolski, Alaska09-08 06:50
  15. 3.2Nikolski, Alaska09-08 17:55
  16. 3.2Nikolski, Alaska09-18 13:19
  17. 3.1Nikolski, Alaska09-06 14:58
  18. 3.1Nikolski, Alaska09-07 12:17
  19. 3.1Nikolski, Alaska09-08 23:04
  20. 3.1Nikolski, Alaska09-11 18:24
  21. 3.1Nikolski, Alaska09-22 21:00
  22. 3.1Nikolski, Alaska10-01 03:38
  23. 3.0Nikolski, Alaska09-05 14:49
  24. 3.0Nikolski, Alaska09-20 10:15
  25. 2.9Nikolski, 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 us7000tfrl. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS (usgs:us7000tfrl). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tfrl-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tfrl. SeismoAtlas is not an official warning service.