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SeismoAtlas

M3.5 earthquake – Nikolski, Alaska

A magnitude 3.5 earthquake struck in the Nikolski, Alaska region at 04:38 UTC on 4 Sept 2026, at a depth of 4 km, according to USGS.

Data: USGS · updated 2026-09-04 15:09 UTC · reviewed

Magnitude
3.5minor
local magnitude (Richter) (ml)
Depth
3.9 km
Status
Reviewed
Origin time
2026-09-04 04:38:51 UTC
Epicentre
51.984° N, 169.175° 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 26 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 · AK, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey3.5 ml3.9 km51.98° N, 169.18° W–Reviewed

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 2.7 t 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 4 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M3.5 releases about 32× the energy of M2.5, and its waves are about 10× taller on a seismogram. Energy: 2.7 t of TNT vs 85 kg of TNT.

Each square is the energy of one M2.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

82 later earthquakes within 30 km; the largest was M4.9 23 days ago. 138 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.542.710
0.832.610
0.982.511
1.552.610
2.212.81
2.472.716
2.772.810
3.292.710
3.892.635
4.082.711
4.783.512
5.753.215
6.982.711
9.502.810
10.024.035
10.912.910
21.363.129
22.313.217
22.633.010
23.072.810
23.672.727
25.652.710
28.502.714
29.332.720
31.802.810
32.282.87
35.593.020
37.354.929
44.472.88
47.733.825
47.792.922
48.522.810
51.172.821
52.412.91
54.662.917
55.862.818
58.333.110
58.823.910
64.592.711
66.022.711
67.042.76
67.232.813
69.823.210
70.672.612
76.602.711
78.132.85
79.643.218
80.442.713
80.602.722
81.662.735
98.203.015
99.573.28
99.632.95
109.283.210
109.812.610
110.232.710
113.472.914
114.423.38
114.502.77
114.653.09
114.812.713
115.732.712
119.882.611
141.852.511
149.732.718
166.253.411
169.712.98
170.752.718
170.852.719
179.532.614
205.633.335
213.132.73
227.272.85
232.032.716
258.222.710
268.072.98
277.122.952
277.372.818
316.552.714
332.483.825
385.303.211
385.362.910
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 3.9Nikolski, Alaska09-06 15:28
  4. 3.8Nikolski, Alaska09-06 04:22
  5. 3.8Nikolski, Alaska09-18 01:07
  6. 3.5Nikolski, Alaska09-04 09:25
  7. 3.4Nikolski, Alaska09-11 02:53
  8. 3.3Nikolski, Alaska09-08 23:04
  9. 3.3Nikolski, Alaska09-12 18:16
  10. 3.2Nikolski, Alaska09-04 10:23
  11. 3.2Nikolski, Alaska09-05 02:57
  12. 3.2Nikolski, Alaska09-07 02:28
  13. 3.2Nikolski, Alaska09-07 12:17
  14. 3.2Nikolski, Alaska09-08 08:13
  15. 3.2Nikolski, Alaska09-08 17:55
  16. 3.2Nikolski, Alaska09-20 05:57
  17. 3.1Nikolski, Alaska09-05 02:00
  18. 3.1Nikolski, Alaska09-06 14:58
  19. 3.0Nikolski, Alaska09-05 03:16
  20. 3.0Nikolski, Alaska09-05 16:14
  21. 3.0Nikolski, Alaska09-08 06:50
  22. 3.0Nikolski, Alaska09-08 23:17
  23. 2.9Nikolski, Alaska09-04 15:33
  24. 2.9Nikolski, Alaska09-06 04:26
  25. 2.9Nikolski, Alaska09-06 09:03

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 aka2026rmsrrw. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rmsrrw). Cite as: SeismoAtlas, “M3.5 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rmsrrw-m3-5-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rmsrrw. SeismoAtlas is not an official warning service.