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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 04:18 UTC on 5 Sept 2026, at a depth of 27 km, according to USGS.

Data: USGS · updated 2026-09-20 02:03 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
Depth
27.2 km
Status
Reviewed
Origin time
2026-09-05 04:18:54 UTC
Epicentre
52.093° N, 169.221° 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 Survey2.7 ml27.2 km52.09° N, 169.22° 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 27 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

74 later earthquakes within 30 km; the largest was M4.9 23 days ago. 180 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.992.710
4.832.714
5.662.720
8.142.810
8.612.87
10.523.07
11.852.75
11.923.020
13.694.929
13.882.820
20.802.88
24.063.825
24.132.922
24.852.810
27.502.821
28.752.91
30.992.917
32.202.818
34.673.110
35.153.910
40.922.711
42.362.711
43.372.76
43.562.813
46.153.210
47.002.612
52.942.711
54.472.85
55.973.218
56.772.713
56.932.722
57.992.735
74.533.015
75.903.28
75.962.95
85.613.210
85.693.410
86.142.610
86.562.710
89.802.914
90.734.046
90.753.38
90.832.77
90.983.09
91.142.713
92.062.712
92.083.650
96.222.611
118.192.511
126.062.718
132.022.735
142.583.411
146.042.98
147.082.718
147.182.719
155.872.614
158.103.135
181.963.335
186.952.539
189.462.73
203.602.85
208.372.716
208.732.935
234.552.710
244.402.98
253.452.952
253.702.818
292.882.714
308.813.825
321.013.245
344.424.041
361.643.211
361.702.910
521.214.035
  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. 3.9Nikolski, Alaska09-06 15:28
  6. 3.8Nikolski, Alaska09-06 04:22
  7. 3.8Nikolski, Alaska09-18 01:07
  8. 3.6Nikolski, Alaska09-09 00:23
  9. 3.4Nikolski, Alaska09-08 18:00
  10. 3.4Nikolski, Alaska09-11 02:53
  11. 3.3Nikolski, Alaska09-08 23:04
  12. 3.3Nikolski, Alaska09-12 18:16
  13. 3.2Nikolski, Alaska09-07 02:28
  14. 3.2Nikolski, Alaska09-07 12:17
  15. 3.2Nikolski, Alaska09-08 08:13
  16. 3.2Nikolski, Alaska09-08 17:55
  17. 3.2Nikolski, Alaska09-18 13:19
  18. 3.2Nikolski, Alaska09-20 05:57
  19. 3.1Nikolski, Alaska09-06 14:58
  20. 3.1Nikolski, Alaska09-11 18:24
  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, Alaska09-06 04:26

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 us7000tfrp. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS (usgs:us7000tfrp). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tfrp-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tfrp. SeismoAtlas is not an official warning service.