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SeismoAtlas

M2.6 earthquake – Nikolski, Alaska

A magnitude 2.6 earthquake struck in the Nikolski, Alaska region at 17:29 UTC on 4 Sept 2026, at a depth of 25 km, according to USGS.

Data: USGS · updated 2026-09-05 04:25 UTC · reviewed

Magnitude
2.6micro
local magnitude (Richter) (ml)
Depth
24.8 km
Status
Reviewed
Origin time
2026-09-04 17:29:21 UTC
Epicentre
52.269° N, 169.505° 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 Survey2.6 ml24.8 km52.27° N, 169.50° W–Reviewed

How big was it?

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

It released roughly the energy of 120 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 25 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.6 releases about 32× the energy of M1.6, and its waves are about 10× taller on a seismogram. Energy: 120 kg of TNT vs 4 kg of TNT.

Each square is the energy of one M1.6. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

52 later earthquakes within 30 km; the largest was M4.9 23 days ago. 122 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.6

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
8.523.129
9.473.217
10.232.810
10.682.535
10.832.727
15.662.714
16.492.720
18.962.810
24.514.929
24.702.820
31.622.88
34.952.922
38.332.821
41.622.814
41.812.917
51.752.711
53.182.711
54.382.813
56.983.210
57.832.612
63.762.711
67.762.722
68.812.735
85.363.015
86.733.28
86.792.95
96.513.410
96.962.610
100.632.914
101.554.046
101.583.38
101.662.77
101.813.09
101.972.713
102.892.712
102.913.650
107.462.53
142.842.735
153.403.411
156.872.98
166.692.614
168.933.135
192.793.335
197.772.539
219.192.716
219.552.935
255.232.98
264.272.952
319.643.825
331.833.245
355.244.041
532.034.035
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-08 23:02
  3. 4.0Nikolski, Alaska09-19 12:44
  4. 4.0Fox Islands, Aleutian Islands09-26 21:31
  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, Alaska09-05 02:57
  12. 3.2Nikolski, Alaska09-07 02:28
  13. 3.2Nikolski, Alaska09-08 08:13
  14. 3.2Nikolski, Alaska09-18 13:19
  15. 3.1Nikolski, Alaska09-05 02:00
  16. 3.1Nikolski, Alaska09-11 18:24
  17. 3.0Nikolski, Alaska09-08 06:50
  18. 3.0Nikolski, Alaska09-08 23:17
  19. 2.9Nikolski, Alaska09-06 04:26
  20. 2.9Nikolski, Alaska09-06 11:18
  21. 2.9Nikolski, Alaska09-08 08:16
  22. 2.9Nikolski, Alaska09-08 22:06
  23. 2.9Nikolski, Alaska09-11 06:21
  24. 2.9Nikolski, Alaska09-13 21:02
  25. 2.9Nikolski, Alaska09-15 08:42

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 aka2026rnsjrj. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rnsjrj). Cite as: SeismoAtlas, “M2.6 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rnsjrj-m2-6-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rnsjrj. SeismoAtlas is not an official warning service.