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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 06:18 UTC on 5 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-27 12:29 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-05 06:18:02 UTC
Epicentre
52.013° N, 169.323° 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 ml10 km52.01° N, 169.32° 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 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

64 later earthquakes within 30 km; the largest was M4.9 23 days ago. 172 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.852.714
3.682.720
6.152.810
6.622.87
9.943.020
11.704.929
18.812.88
22.073.825
22.142.922
22.872.810
25.522.821
26.762.91
29.002.917
30.212.818
32.683.110
33.173.910
38.942.711
40.372.711
41.382.76
41.572.813
44.173.210
45.022.612
50.952.711
52.482.85
53.983.218
54.792.713
54.952.722
56.002.735
72.553.015
73.923.28
73.982.95
83.633.210
83.703.410
84.152.610
84.572.710
87.822.914
88.773.38
88.852.77
89.003.09
89.162.713
90.082.712
94.232.611
116.202.511
140.593.411
144.062.98
145.102.718
145.202.719
153.882.614
156.123.135
179.973.335
184.962.539
187.482.73
201.622.85
206.382.716
232.562.710
242.422.98
251.462.952
251.712.818
290.902.714
306.833.825
319.023.245
342.434.041
359.653.211
359.712.910
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-19 12:44
  3. 3.9Nikolski, Alaska09-06 15:28
  4. 3.8Nikolski, Alaska09-06 04:22
  5. 3.8Nikolski, Alaska09-18 01:07
  6. 3.4Nikolski, Alaska09-08 18:00
  7. 3.4Nikolski, Alaska09-11 02:53
  8. 3.3Nikolski, Alaska09-08 23:04
  9. 3.3Nikolski, Alaska09-12 18:16
  10. 3.2Nikolski, Alaska09-07 02:28
  11. 3.2Nikolski, Alaska09-07 12:17
  12. 3.2Nikolski, Alaska09-08 08:13
  13. 3.2Nikolski, Alaska09-08 17:55
  14. 3.2Nikolski, Alaska09-18 13:19
  15. 3.2Nikolski, Alaska09-20 05:57
  16. 3.1Nikolski, Alaska09-06 14:58
  17. 3.1Nikolski, Alaska09-11 18:24
  18. 3.0Nikolski, Alaska09-05 16:14
  19. 3.0Nikolski, Alaska09-08 06:50
  20. 3.0Nikolski, Alaska09-08 23:17
  21. 2.9Nikolski, Alaska09-06 04:26
  22. 2.9Nikolski, Alaska09-06 09:03
  23. 2.9Nikolski, Alaska09-06 11:18
  24. 2.9Nikolski, Alaska09-08 08:16
  25. 2.9Nikolski, Alaska09-08 22:06

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 us7000tfrf. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS (usgs:us7000tfrf). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000tfrf-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000tfrf. SeismoAtlas is not an official warning service.