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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 07:49 UTC on 6 Sept 2026, at a depth of 21 km, according to USGS.

Data: USGS · updated 2026-09-09 18:11 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
20.8 km
Status
Reviewed
Origin time
2026-09-06 07:49:02 UTC
Epicentre
52.175° N, 169.330° 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 ml20.8 km52.17° N, 169.33° 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 21 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

53 later earthquakes within 30 km; the largest was M4.0 19 days ago. 200 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.242.91
3.492.917
4.692.818
7.163.110
7.653.910
13.422.711
14.862.711
16.062.813
18.653.210
19.502.612
25.432.711
29.272.713
29.432.722
30.492.735
47.033.015
48.403.28
48.462.95
58.113.210
58.183.410
58.642.610
59.062.710
62.302.914
63.234.046
63.253.38
63.332.77
63.483.09
63.642.713
64.562.712
64.583.650
68.712.611
90.692.511
104.522.735
115.083.411
118.542.98
119.582.718
119.682.719
128.362.614
130.603.135
154.463.335
159.452.539
180.872.716
181.232.935
207.052.710
216.902.98
225.952.952
226.202.818
265.382.714
281.313.825
293.513.245
316.924.041
334.133.211
334.202.910
493.704.035
  1. 4.0Nikolski, Alaska09-08 23:02
  2. 4.0Nikolski, Alaska09-19 12:44
  3. 4.0Fox Islands, Aleutian Islands09-26 21:31
  4. 3.9Nikolski, Alaska09-06 15:28
  5. 3.8Nikolski, Alaska09-18 01:07
  6. 3.6Nikolski, Alaska09-09 00:23
  7. 3.4Nikolski, Alaska09-08 18:00
  8. 3.4Nikolski, Alaska09-11 02:53
  9. 3.3Nikolski, Alaska09-08 23:04
  10. 3.3Nikolski, Alaska09-12 18:16
  11. 3.2Nikolski, Alaska09-07 02:28
  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, Alaska09-06 14:58
  17. 3.1Nikolski, Alaska09-11 18:24
  18. 3.0Nikolski, Alaska09-08 06:50
  19. 3.0Nikolski, Alaska09-08 23:17
  20. 2.9Nikolski, Alaska09-06 09:03
  21. 2.9Nikolski, Alaska09-06 11:18
  22. 2.9Nikolski, Alaska09-08 08:16
  23. 2.9Nikolski, Alaska09-08 22:06
  24. 2.9Nikolski, Alaska09-11 06:21
  25. 2.9Nikolski, Alaska09-13 21:02

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 aka2026rqrbql. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · AK (usgs:aka2026rqrbql). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rqrbql-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rqrbql. SeismoAtlas is not an official warning service.