Skip to content
SeismoAtlas

M2.8 earthquake – Nikolski, Alaska

A magnitude 2.8 earthquake struck in the Nikolski, Alaska region at 12:30 UTC on 6 Sept 2026, at a depth of 18 km, according to USGS.

Data: USGS · updated 2026-09-09 19:34 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
18.3 km
Status
Reviewed
Origin time
2026-09-06 12:30:39 UTC
Epicentre
51.962° N, 169.147° 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 · AK, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey2.8 ml18.3 km51.96° N, 169.15° W–Reviewed

How big was it?

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

It released roughly the energy of 239 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 18 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.8 releases about 32× the energy of M1.8, and its waves are about 10× taller on a seismogram. Energy: 239 kg of TNT vs 8 kg of TNT.

Each square is the energy of one M1.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

46 later earthquakes within 30 km; the largest was M3.9 22 days ago. 162 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.473.110
2.963.910
8.732.711
10.162.711
11.172.76
11.362.813
13.963.210
14.812.612
20.742.711
22.272.85
23.773.218
24.582.713
24.742.722
25.792.735
43.713.28
43.772.95
53.423.210
53.942.610
54.362.710
57.602.914
58.563.38
58.632.77
58.793.09
58.952.713
59.872.712
64.022.611
85.992.511
93.872.718
98.092.622
110.383.411
113.852.98
114.892.718
114.992.719
123.672.614
149.763.335
157.272.73
171.412.85
176.172.716
202.352.710
212.212.98
221.252.952
221.502.818
260.692.714
276.623.825
329.443.211
329.502.910
  1. 3.9Nikolski, Alaska09-06 15:28
  2. 3.8Nikolski, Alaska09-18 01:07
  3. 3.4Nikolski, Alaska09-11 02:53
  4. 3.3Nikolski, Alaska09-08 23:04
  5. 3.3Nikolski, Alaska09-12 18:16
  6. 3.2Nikolski, Alaska09-07 02:28
  7. 3.2Nikolski, Alaska09-07 12:17
  8. 3.2Nikolski, Alaska09-08 08:13
  9. 3.2Nikolski, Alaska09-08 17:55
  10. 3.2Nikolski, Alaska09-20 05:57
  11. 3.1Nikolski, Alaska09-06 14:58
  12. 3.0Nikolski, Alaska09-08 23:17
  13. 2.9Nikolski, Alaska09-08 08:16
  14. 2.9Nikolski, Alaska09-08 22:06
  15. 2.9Nikolski, Alaska09-11 06:21
  16. 2.9Nikolski, Alaska09-15 08:42
  17. 2.9Nikolski, Alaska09-15 17:45
  18. 2.9Nikolski, Alaska09-20 06:00
  19. 2.8Nikolski, Alaska09-06 23:52
  20. 2.8Nikolski, Alaska09-07 10:46
  21. 2.8Nikolski, Alaska09-13 15:54
  22. 2.8Nikolski, Alaska09-15 18:00
  23. 2.7Nikolski, Alaska09-06 21:14
  24. 2.7Nikolski, Alaska09-06 22:40
  25. 2.7Nikolski, Alaska09-06 23:41

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 aka2026rramay. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · AK (usgs:aka2026rramay). Cite as: SeismoAtlas, “M2.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rramay-m2-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rramay. SeismoAtlas is not an official warning service.