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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 05:10 UTC on 6 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-17 06:09 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-06 05:10:07 UTC
Epicentre
52.041° N, 169.191° 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 km52.04° N, 169.19° 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

68 later earthquakes within 30 km; the largest was M4.0 65 days ago. 191 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.652.821
3.892.710
6.132.917
7.342.818
9.813.110
10.303.910
16.072.711
17.502.711
18.522.76
18.712.813
21.303.210
22.152.612
28.082.711
29.612.85
31.123.110
31.922.713
32.082.722
33.132.735
49.683.210
51.052.910
51.112.710
60.763.210
61.282.610
61.712.710
64.952.810
65.874.035
65.903.110
65.982.77
66.132.710
66.292.713
67.212.712
67.233.740
71.362.611
93.332.511
117.733.310
121.192.810
122.232.718
122.332.719
131.012.614
133.253.135
157.113.335
164.612.59
178.752.85
183.512.716
183.872.935
209.702.710
219.552.710
228.602.952
228.852.818
268.032.714
283.963.810
336.782.923
336.842.910
341.093.010
393.042.55
399.853.114
400.012.910
401.482.714
421.083.334
496.354.035
545.722.521
547.922.78
548.472.87
566.622.63
575.592.810
575.772.810
583.062.510
598.473.110
  1. 4.0Nikolski, Alaska09-08 23:02
  2. 4.0Fox Islands, Aleutian Islands09-26 21:31
  3. 3.9Nikolski, Alaska09-06 15:28
  4. 3.8Nikolski, Alaska09-18 01:07
  5. 3.7Nikolski, Alaska09-09 00:23
  6. 3.3Nikolski, Alaska09-11 02:53
  7. 3.3Nikolski, Alaska09-12 18:16
  8. 3.3Nikolski, Alaska09-23 18:14
  9. 3.2Nikolski, Alaska09-07 02:28
  10. 3.2Nikolski, Alaska09-08 06:50
  11. 3.2Nikolski, Alaska09-08 17:55
  12. 3.1Nikolski, Alaska09-06 14:58
  13. 3.1Nikolski, Alaska09-07 12:17
  14. 3.1Nikolski, Alaska09-08 23:04
  15. 3.1Nikolski, Alaska09-11 18:24
  16. 3.1Nikolski, Alaska09-22 21:00
  17. 3.1Nikolski, Alaska10-01 03:38
  18. 3.0Nikolski, Alaska09-20 10:15
  19. 2.9Nikolski, Alaska09-06 11:18
  20. 2.9Nikolski, Alaska09-08 08:13
  21. 2.9Nikolski, Alaska09-13 21:02
  22. 2.9Nikolski, Alaska09-15 17:45
  23. 2.9Nikolski, Alaska09-20 05:57
  24. 2.9Nikolski, Alaska09-20 06:00
  25. 2.9Nikolski, Alaska09-22 21:10

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 us7000tg3r. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS (usgs:us7000tg3r). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tg3r-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tg3r. SeismoAtlas is not an official warning service.