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SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 14:08 UTC on 4 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-28 14:51 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-04 14:08:48 UTC
Epicentre
52.093° N, 169.174° 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 km52.09° 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

80 later earthquakes within 30 km; the largest was M4.9 23 days ago. 169 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.524.035
1.412.910
3.342.625
11.863.129
12.813.217
13.133.010
13.582.810
14.172.727
16.152.710
19.002.714
19.832.720
22.312.810
22.782.87
24.683.07
26.012.75
26.093.020
27.864.929
28.052.820
34.972.88
38.233.825
38.292.922
39.022.810
41.672.821
42.912.91
45.162.917
46.362.818
48.843.110
49.323.910
55.092.711
56.532.711
57.542.76
57.732.813
60.323.210
61.172.612
67.112.711
68.632.85
70.143.218
70.942.713
71.102.722
72.162.735
88.703.015
90.073.28
90.132.95
99.783.210
99.863.410
100.312.610
100.732.710
103.972.914
104.904.046
104.923.38
105.002.77
105.153.09
105.312.713
106.232.712
110.382.611
132.362.511
140.232.718
146.192.735
156.753.411
160.212.98
161.252.718
161.352.719
170.042.614
172.273.135
196.133.335
201.122.539
203.632.73
217.772.85
222.542.716
222.902.935
248.722.710
258.572.98
267.622.952
267.872.818
307.052.714
322.983.825
358.594.041
375.813.211
375.872.910
535.384.035
  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. 3.4Nikolski, 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, Alaska09-05 02:57
  14. 3.2Nikolski, Alaska09-07 02:28
  15. 3.2Nikolski, Alaska09-07 12:17
  16. 3.2Nikolski, Alaska09-08 08:13
  17. 3.2Nikolski, Alaska09-08 17:55
  18. 3.2Nikolski, Alaska09-20 05:57
  19. 3.1Nikolski, Alaska09-05 02:00
  20. 3.1Nikolski, Alaska09-06 14:58
  21. 3.1Nikolski, Alaska09-11 18:24
  22. 3.0Nikolski, Alaska09-05 03:16
  23. 3.0Nikolski, Alaska09-05 14:49
  24. 3.0Nikolski, Alaska09-05 16:14
  25. 3.0Nikolski, Alaska09-08 06:50

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 us7000tefv. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000tefv). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tefv-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tefv. SeismoAtlas is not an official warning service.