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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 16:09 UTC on 5 Sept 2026, at a depth of 5 km, according to USGS.

Data: USGS · updated 2026-09-10 21:45 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
Depth
5 km
Status
Reviewed
Origin time
2026-09-05 16:09:37 UTC
Epicentre
52.259° N, 169.060° 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 11 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 · AK, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey2.7 ml5 km52.26° N, 169.06° 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 5 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

47 later earthquakes within 30 km; the largest was M4.9 23 days ago. 151 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.844.929
2.032.820
8.952.88
13.012.810
15.662.821
16.902.91
19.142.917
23.313.910
29.082.711
30.512.711
31.712.813
34.313.210
35.162.612
41.092.711
44.932.713
46.142.735
62.693.015
64.063.28
64.122.95
74.292.610
74.712.710
77.962.914
78.884.046
78.913.38
78.992.77
79.143.09
79.302.713
80.222.712
80.243.650
114.222.718
120.172.735
130.733.411
134.202.98
144.022.614
146.263.135
170.113.335
196.522.716
196.882.935
232.562.98
241.602.952
281.042.714
296.973.825
332.574.041
349.793.211
349.852.910
359.072.710
509.364.035
  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, Alaska09-18 01:07
  7. 3.6Nikolski, Alaska09-09 00:23
  8. 3.4Nikolski, Alaska09-11 02:53
  9. 3.3Nikolski, Alaska09-08 23:04
  10. 3.3Nikolski, Alaska09-12 18:16
  11. 3.2Nikolski, Alaska09-07 02:28
  12. 3.2Nikolski, Alaska09-08 08:13
  13. 3.2Nikolski, Alaska09-20 05:57
  14. 3.1Nikolski, Alaska09-11 18:24
  15. 3.0Nikolski, Alaska09-08 06:50
  16. 3.0Nikolski, Alaska09-08 23:17
  17. 2.9Nikolski, Alaska09-06 09:03
  18. 2.9Nikolski, Alaska09-06 11:18
  19. 2.9Nikolski, Alaska09-08 08:16
  20. 2.9Nikolski, Alaska09-08 22:06
  21. 2.9Nikolski, Alaska09-11 06:21
  22. 2.9Nikolski, Alaska09-13 21:02
  23. 2.9Nikolski, Alaska09-15 08:42
  24. 2.9Nikolski, Alaska09-15 17:45
  25. 2.9Nikolski, Alaska09-20 06:00

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 aka2026rpltcn. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · AK (usgs:aka2026rpltcn). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rpltcn-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rpltcn. SeismoAtlas is not an official warning service.