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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 11:37 UTC on 4 Sept 2026, at a depth of 11 km, according to USGS.

Data: USGS · updated 2026-09-28 11:19 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
Depth
10.8 km
Status
Reviewed
Origin time
2026-09-04 11:37:25 UTC
Epicentre
52.103° N, 169.340° 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 4 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 Survey2.7 ml10.8 km52.10° N, 169.34° W–Reviewed

How big was it?

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

It released roughly the energy of 169 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.

M2.7 releases about 32× the energy of M1.7, and its waves are about 10× taller on a seismogram. Energy: 169 kg of TNT vs 5 kg of TNT.

Each square is the energy of one M1.7. 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. 169 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.522.810
3.044.035
3.942.910
5.872.625
14.393.129
15.343.217
15.653.010
16.102.810
16.542.535
16.692.727
18.682.710
21.532.714
22.352.720
24.832.810
25.302.87
27.213.07
28.542.75
28.623.020
30.384.929
30.572.820
37.492.88
40.753.825
40.822.922
41.542.810
44.192.821
45.442.91
47.682.917
48.892.818
51.363.110
51.843.910
57.622.711
59.052.711
60.062.76
60.252.813
62.843.210
63.692.612
69.632.711
71.162.85
72.663.218
73.472.713
73.622.722
74.682.735
91.223.015
92.593.28
92.652.95
102.313.210
102.383.410
102.832.610
103.252.710
106.492.914
107.424.046
107.443.38
107.522.77
107.673.09
107.832.713
108.752.712
108.773.650
112.912.611
134.882.511
148.712.735
159.273.411
162.732.98
163.782.718
163.872.719
172.562.614
174.793.135
198.653.335
203.642.539
220.292.85
225.062.716
225.422.935
251.242.710
261.092.98
270.142.952
270.392.818
309.572.714
325.503.825
337.703.245
361.114.041
378.333.211
378.392.910
537.904.035
  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. 3.4Nikolski, Alaska09-08 18:00
  11. 3.4Nikolski, Alaska09-11 02:53
  12. 3.3Nikolski, Alaska09-08 23:04
  13. 3.3Nikolski, Alaska09-12 18:16
  14. 3.2Nikolski, Alaska09-05 02:57
  15. 3.2Nikolski, Alaska09-07 02:28
  16. 3.2Nikolski, Alaska09-07 12:17
  17. 3.2Nikolski, Alaska09-08 08:13
  18. 3.2Nikolski, Alaska09-08 17:55
  19. 3.2Nikolski, Alaska09-18 13:19
  20. 3.2Nikolski, Alaska09-20 05:57
  21. 3.1Nikolski, Alaska09-05 02:00
  22. 3.1Nikolski, Alaska09-06 14:58
  23. 3.1Nikolski, Alaska09-11 18:24
  24. 3.0Nikolski, Alaska09-05 03:16
  25. 3.0Nikolski, Alaska09-05 14:49

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 us7000teff. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000teff). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000teff-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000teff. SeismoAtlas is not an official warning service.