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SeismoAtlas

M2.5 earthquake – Nikolski, Alaska

A magnitude 2.5 earthquake struck in the Nikolski, Alaska region at 05:37 UTC on 4 Sept 2026, at a depth of 11 km, according to USGS.

Data: USGS · updated 2026-09-07 05:55 UTC · reviewed

Magnitude
2.5micro
local magnitude (Richter) (ml)
Depth
11.4 km
Status
Reviewed
Origin time
2026-09-04 05:37:27 UTC
Epicentre
52.045° N, 169.138° 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, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey2.5 ml11.4 km52.05° N, 169.14° W–Reviewed

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 85 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 11 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.5 releases about 32× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 85 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

86 later earthquakes within 30 km; the largest was M4.9 23 days ago. 153 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.582.610
1.232.81
1.502.716
1.802.810
2.322.710
2.912.635
3.112.711
3.372.722
3.803.512
4.773.215
6.002.711
8.522.810
9.044.035
9.942.910
20.393.129
21.343.217
21.653.010
22.102.810
22.692.727
24.682.710
27.522.714
28.352.720
30.832.810
31.302.87
33.213.07
34.542.75
34.623.020
36.384.929
36.572.820
43.492.88
46.753.825
46.822.922
47.542.810
50.192.821
51.442.91
53.682.917
54.892.818
57.363.110
57.843.910
63.622.711
65.052.711
66.062.76
66.252.813
68.843.210
69.692.612
75.632.711
77.162.85
78.663.218
79.462.713
79.622.722
80.682.735
97.223.015
98.593.28
98.652.95
108.313.210
108.832.610
109.252.710
112.492.914
113.443.38
113.522.77
113.673.09
113.832.713
114.752.712
118.912.611
140.882.511
148.752.718
152.982.622
165.273.411
168.732.98
169.772.718
169.872.719
178.562.614
180.793.135
204.653.335
212.152.73
226.292.85
231.062.716
231.422.935
257.242.710
267.092.98
276.142.952
276.392.818
315.572.714
331.503.825
384.333.211
384.392.910
  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. 3.1Nikolski, Alaska09-11 18:24
  20. 3.0Nikolski, Alaska09-05 03:16
  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, Alaska09-04 15:33

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 us7000teeb. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000teeb). Cite as: SeismoAtlas, “M2.5 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000teeb-m2-5-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000teeb. SeismoAtlas is not an official warning service.