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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 07:25 UTC on 4 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-13 08:55 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-04 07:25:19 UTC
Epicentre
52.159° N, 169.173° 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 km52.16° N, 169.17° 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

91 later earthquakes within 30 km; the largest was M4.9 23 days ago. 162 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.522.710
0.892.75
1.112.635
1.312.711
1.572.722
2.003.512
2.973.215
4.202.711
4.632.635
6.722.810
7.244.035
8.142.910
10.072.625
18.593.129
19.543.217
19.853.010
20.302.810
20.742.535
20.892.727
22.882.710
25.732.714
26.552.720
29.032.810
29.502.87
31.413.07
32.742.75
32.823.020
34.584.929
34.772.820
41.692.88
44.953.825
45.022.922
45.752.810
48.402.821
49.642.91
51.882.917
53.092.818
55.563.110
56.053.910
61.822.711
63.252.711
64.262.76
64.452.813
67.053.210
67.892.612
73.832.711
76.863.218
77.672.713
77.822.722
78.882.735
95.433.015
96.793.28
96.862.95
106.513.210
106.583.410
107.032.610
107.452.710
110.692.914
111.624.046
111.643.38
111.722.77
111.883.09
112.042.713
112.962.712
112.973.650
117.112.611
139.082.511
146.962.718
152.912.735
163.473.411
166.932.98
167.982.718
168.082.719
176.762.614
178.993.135
202.853.335
207.842.539
224.492.85
229.262.716
229.622.935
255.442.710
265.292.98
274.342.952
274.592.818
313.782.714
329.713.825
365.314.041
382.533.211
382.592.910
391.812.710
542.104.035
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 4.0Nikolski, Alaska09-08 23:02
  4. 4.0Nikolski, Alaska09-19 12:44
  5. 4.0Fox Islands, Aleutian Islands09-26 21:31
  6. 3.9Nikolski, Alaska09-06 15:28
  7. 3.8Nikolski, Alaska09-06 04:22
  8. 3.8Nikolski, Alaska09-18 01:07
  9. 3.6Nikolski, Alaska09-09 00:23
  10. 3.5Nikolski, Alaska09-04 09:25
  11. 3.4Nikolski, Alaska09-08 18:00
  12. 3.4Nikolski, Alaska09-11 02:53
  13. 3.3Nikolski, Alaska09-08 23:04
  14. 3.3Nikolski, Alaska09-12 18:16
  15. 3.2Nikolski, Alaska09-04 10:23
  16. 3.2Nikolski, Alaska09-05 02:57
  17. 3.2Nikolski, Alaska09-07 02:28
  18. 3.2Nikolski, Alaska09-07 12:17
  19. 3.2Nikolski, Alaska09-08 08:13
  20. 3.2Nikolski, Alaska09-08 17:55
  21. 3.2Nikolski, Alaska09-20 05:57
  22. 3.1Nikolski, Alaska09-05 02:00
  23. 3.1Nikolski, Alaska09-06 14:58
  24. 3.1Nikolski, Alaska09-11 18:24
  25. 3.0Nikolski, Alaska09-05 03:16

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 us7000teel. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000teel). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000teel-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000teel. SeismoAtlas is not an official warning service.