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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 18:11 UTC on 5 Sept 2026, at a depth of 20 km, according to USGS.

Data: USGS · updated 2026-09-09 20:44 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
20 km
Status
Reviewed
Origin time
2026-09-05 18:11:38 UTC
Epicentre
52.282° N, 169.098° 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 km52.28° N, 169.10° 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 20 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

46 later earthquakes within 30 km; the largest was M4.0 19 days ago. 153 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
6.922.88
10.972.810
13.622.821
14.872.91
17.112.917
21.273.910
27.052.711
28.482.711
29.682.813
32.273.210
33.122.612
39.062.711
42.892.713
44.112.735
60.653.015
62.023.28
62.082.95
71.813.410
72.262.610
72.682.710
75.922.914
76.854.046
76.873.38
76.952.77
77.103.09
77.262.713
78.182.712
78.203.650
112.182.718
118.142.735
128.703.411
132.162.98
141.992.614
144.223.135
168.083.335
194.492.716
194.852.935
230.522.98
239.572.952
279.002.714
294.933.825
330.544.041
347.763.211
347.822.910
357.042.710
507.334.035
  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, Alaska09-20 05:57
  14. 3.1Nikolski, Alaska09-11 18:24
  15. 3.0Nikolski, Alaska09-08 06:50
  16. 3.0Nikolski, Alaska09-08 23:17
  17. 2.9Nikolski, Alaska09-06 09:03
  18. 2.9Nikolski, Alaska09-06 11:18
  19. 2.9Nikolski, Alaska09-08 08:16
  20. 2.9Nikolski, Alaska09-08 22:06
  21. 2.9Nikolski, Alaska09-11 06:21
  22. 2.9Nikolski, Alaska09-13 21:02
  23. 2.9Nikolski, Alaska09-15 08:42
  24. 2.9Nikolski, Alaska09-15 17:45
  25. 2.9Nikolski, Alaska09-20 06:00

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 aka2026rppuxz. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · AK (usgs:aka2026rppuxz). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rppuxz-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rppuxz. SeismoAtlas is not an official warning service.