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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 02:50 UTC on 4 Sept 2026, at a depth of 10 km, according to USGS.

revised from M3.0

Data: USGS · updated 2026-09-29 01:07 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
revised from 3.0
Depth
10 km
Status
Reviewed
Origin time
2026-09-04 02:50:54 UTC
Epicentre
52.026° N, 169.284° 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 6 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 mlwas 3.010 km52.03° N, 169.28° W–Reviewed · 1 revision

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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 10 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

95 later earthquakes within 30 km; the largest was M4.9 23 days ago. 147 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.692.824
0.733.79
0.842.824
1.382.830
1.803.54
2.252.812
2.342.710
2.632.610
2.782.511
3.352.610
4.012.81
4.272.716
4.572.810
5.092.710
5.692.635
5.882.711
6.152.722
6.573.512
7.553.215
8.782.711
11.302.810
11.824.035
12.712.910
23.163.129
24.113.217
24.433.010
24.872.810
25.472.727
27.452.710
30.302.714
31.132.720
33.602.810
34.072.87
37.393.020
39.154.929
46.272.88
49.523.825
49.592.922
50.322.810
52.972.821
54.212.91
56.452.917
57.662.818
60.133.110
60.623.910
66.392.711
67.822.711
68.842.76
69.032.813
71.623.210
72.472.612
78.402.711
79.932.85
81.443.218
82.242.713
82.402.722
83.452.735
100.003.015
101.373.28
101.432.95
111.083.210
111.153.410
111.602.610
112.032.710
115.272.914
116.223.38
116.302.77
116.453.09
116.612.713
117.532.712
121.682.611
143.652.511
157.482.735
168.053.411
171.512.98
172.552.718
172.652.719
181.332.614
183.573.135
207.433.335
212.412.539
214.932.73
229.072.85
233.832.716
234.192.935
260.022.710
269.872.98
278.922.952
279.172.818
318.352.714
334.283.825
346.483.245
369.894.041
387.103.211
387.162.910
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-04 14:39
  3. 4.0Nikolski, Alaska09-19 12:44
  4. 3.9Nikolski, Alaska09-06 15:28
  5. 3.8Nikolski, Alaska09-06 04:22
  6. 3.8Nikolski, Alaska09-18 01:07
  7. 3.7Nikolski, Alaska09-04 03:34
  8. 3.5Nikolski, Alaska09-04 04:38
  9. 3.5Nikolski, Alaska09-04 09:25
  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, Alaska09-04 10:23
  15. 3.2Nikolski, Alaska09-05 02:57
  16. 3.2Nikolski, Alaska09-07 02:28
  17. 3.2Nikolski, Alaska09-07 12:17
  18. 3.2Nikolski, Alaska09-08 08:13
  19. 3.2Nikolski, Alaska09-08 17:55
  20. 3.2Nikolski, Alaska09-18 13:19
  21. 3.2Nikolski, Alaska09-20 05:57
  22. 3.1Nikolski, Alaska09-05 02:00
  23. 3.1Nikolski, Alaska09-06 14:58
  24. 3.1Nikolski, Alaska09-11 18:24
  25. 3.0Nikolski, Alaska09-05 03:16

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 aka2026rmpbyg. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000tedf). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rmpbyg-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rmpbyg. SeismoAtlas is not an official warning service.