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SeismoAtlas

M2.7 earthquake – Nikolski, Alaska

A magnitude 2.7 earthquake struck in the Nikolski, Alaska region at 09:58 UTC on 5 Sept 2026, at a depth of 20 km, according to USGS.

Data: USGS · updated 2026-09-08 07:02 UTC · reviewed

Magnitude
2.7micro
local magnitude (Richter) (ml)
Depth
19.8 km
Status
Reviewed
Origin time
2026-09-05 09:58:33 UTC
Epicentre
52.033° N, 169.377° 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 Survey2.7 ml19.8 km52.03° N, 169.38° 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 20 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

65 later earthquakes within 30 km; the largest was M4.9 23 days ago. 177 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.482.810
2.952.87
6.263.020
8.034.929
15.142.88
18.403.825
18.462.922
19.192.810
21.842.821
23.082.91
25.332.917
26.542.818
29.013.110
29.493.910
35.262.711
36.702.711
37.712.76
37.902.813
40.493.210
41.342.612
47.282.711
48.812.85
50.313.218
51.112.713
51.272.722
52.332.735
68.873.015
70.243.28
70.302.95
79.953.210
80.033.410
80.482.610
80.902.710
84.142.914
85.093.38
85.172.77
85.323.09
85.482.713
86.402.712
90.562.611
112.532.511
126.362.735
136.923.411
140.382.98
141.422.718
141.522.719
150.212.614
152.443.135
176.303.335
181.292.539
183.802.73
197.942.85
202.712.716
203.072.935
228.892.710
238.742.98
247.792.952
248.042.818
287.222.714
303.153.825
315.353.245
338.764.041
355.983.211
356.042.910
515.554.035
  1. 4.9Nikolski, Alaska09-05 18:00
  2. 4.0Nikolski, Alaska09-19 12:44
  3. 4.0Fox Islands, Aleutian Islands09-26 21:31
  4. 3.9Nikolski, Alaska09-06 15:28
  5. 3.8Nikolski, Alaska09-06 04:22
  6. 3.8Nikolski, Alaska09-18 01:07
  7. 3.4Nikolski, Alaska09-08 18:00
  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, Alaska09-07 12:17
  13. 3.2Nikolski, Alaska09-08 08:13
  14. 3.2Nikolski, Alaska09-08 17:55
  15. 3.2Nikolski, Alaska09-18 13:19
  16. 3.2Nikolski, Alaska09-20 05:57
  17. 3.1Nikolski, Alaska09-06 14:58
  18. 3.1Nikolski, Alaska09-11 18:24
  19. 3.0Nikolski, Alaska09-05 16:14
  20. 3.0Nikolski, Alaska09-08 06:50
  21. 3.0Nikolski, Alaska09-08 23:17
  22. 2.9Nikolski, Alaska09-06 04:26
  23. 2.9Nikolski, Alaska09-06 09:03
  24. 2.9Nikolski, Alaska09-06 11:18
  25. 2.9Nikolski, Alaska09-08 08:16

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 aka2026rozjmg. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · AK (usgs:aka2026rozjmg). Cite as: SeismoAtlas, “M2.7 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/aka2026rozjmg-m2-7-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/aka2026rozjmg. SeismoAtlas is not an official warning service.