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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 12:27 UTC on 5 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-16 14:33 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-05 12:27:08 UTC
Epicentre
52.100° N, 169.230° 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 km52.10° N, 169.23° 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

70 later earthquakes within 30 km; the largest was M4.9 23 days ago. 184 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.472.87
2.383.07
3.712.75
3.793.020
5.554.929
5.742.820
12.662.88
15.923.825
15.992.922
16.722.810
19.372.821
20.612.91
22.852.917
24.062.818
26.533.110
27.023.910
32.792.711
34.222.711
35.232.76
35.422.813
38.023.210
38.862.612
44.802.711
46.332.85
47.833.218
48.642.713
48.792.722
49.852.735
66.403.015
67.763.28
67.832.95
77.483.210
77.553.410
78.002.610
78.422.710
81.662.914
82.594.046
82.613.38
82.692.77
82.853.09
83.012.713
83.932.712
83.943.650
88.082.611
110.052.511
117.932.718
123.882.735
134.443.411
137.902.98
138.952.718
139.052.719
147.732.614
149.963.135
173.823.335
178.812.539
181.322.73
195.462.85
200.232.716
200.592.935
226.412.710
236.262.98
245.312.952
245.562.818
284.752.714
300.683.825
312.873.245
336.284.041
353.503.211
353.562.910
513.074.035
  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. 3.6Nikolski, Alaska09-09 00:23
  9. 3.4Nikolski, Alaska09-08 18:00
  10. 3.4Nikolski, Alaska09-11 02:53
  11. 3.3Nikolski, Alaska09-08 23:04
  12. 3.3Nikolski, Alaska09-12 18:16
  13. 3.2Nikolski, Alaska09-07 02:28
  14. 3.2Nikolski, Alaska09-07 12:17
  15. 3.2Nikolski, Alaska09-08 08:13
  16. 3.2Nikolski, Alaska09-08 17:55
  17. 3.2Nikolski, Alaska09-18 13:19
  18. 3.2Nikolski, Alaska09-20 05:57
  19. 3.1Nikolski, Alaska09-06 14:58
  20. 3.1Nikolski, Alaska09-11 18:24
  21. 3.0Nikolski, Alaska09-05 14:49
  22. 3.0Nikolski, Alaska09-05 16:14
  23. 3.0Nikolski, Alaska09-08 06:50
  24. 3.0Nikolski, Alaska09-08 23:17
  25. 2.9Nikolski, Alaska09-06 04:26

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 us7000tggr. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS (usgs:us7000tggr). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tggr-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tggr. SeismoAtlas is not an official warning service.