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SeismoAtlas

M3.1 earthquake – Nikolski, Alaska

A magnitude 3.1 earthquake struck in the Nikolski, Alaska region at 17:40 UTC on 3 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-10 20:05 UTC · reviewed

Magnitude
3.1minor
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-03 17:40:53 UTC
Epicentre
52.123° N, 169.174° 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 14 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 Survey3.1 ml10 km52.12° N, 169.17° W–Reviewed

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 674 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.

M3.1 releases about 32× the energy of M2.1, and its waves are about 10× taller on a seismogram. Energy: 674 kg of TNT vs 21 kg of TNT.

Each square is the energy of one M2.1. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

147 later earthquakes within 30 km; the largest was M5.4 25 days ago. 104 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.322.811
0.883.724
0.982.610
1.032.87
1.085.310
1.273.410
1.432.77
1.603.010
1.702.510
1.742.610
2.463.035
2.573.725
2.675.410
2.843.838
2.994.410
3.212.615
3.272.812
4.922.810
4.982.88
5.023.310
5.202.710
5.223.310
5.533.010
5.692.723
5.742.610
5.842.510
6.232.811
6.272.910
6.352.610
7.582.916
7.812.97
7.953.010
8.113.310
8.152.810
8.163.810
8.302.510
8.413.010
8.433.925
8.642.510
8.682.610
8.732.88
8.983.010
9.173.019
9.862.824
9.903.79
10.002.824
10.542.830
10.973.54
11.422.812
11.502.710
11.792.610
11.942.511
12.522.610
13.182.81
13.442.716
13.742.810
14.262.710
14.632.75
14.852.635
15.052.711
15.312.722
15.743.512
16.713.215
17.942.711
18.372.635
20.472.810
20.984.035
21.882.910
23.812.625
32.333.129
33.283.217
33.593.010
34.042.810
34.482.535
34.632.727
36.622.710
39.472.714
40.292.720
42.772.810
43.242.87
45.153.07
46.482.75
46.563.020
48.324.929
48.512.820
55.432.88
58.693.825
58.762.922
59.492.810
62.142.821
63.382.91
65.622.917
66.832.818
69.303.110
69.793.910
75.562.711
76.992.711
78.002.76
78.192.813
80.793.210
81.632.612
87.572.711
90.603.218
91.412.713
91.572.722
92.622.735
109.173.015
110.543.28
110.602.95
120.253.210
120.323.410
120.772.610
121.192.710
124.432.914
125.364.046
125.393.38
125.462.77
125.623.09
125.782.713
126.702.712
126.723.650
130.852.611
152.822.511
160.702.718
166.652.735
177.213.411
180.672.98
181.722.718
181.822.719
190.502.614
192.733.135
216.593.335
221.582.539
238.232.85
243.002.716
243.362.935
269.182.710
279.032.98
288.082.952
288.332.818
327.522.714
343.453.825
379.054.041
396.273.211
396.332.910
405.552.710
555.844.035
  1. 5.4Nikolski, Alaska09-03 20:21
  2. 5.3Nikolski, Alaska09-03 18:45
  3. 4.9Nikolski, Alaska09-05 18:00
  4. 4.4Nikolski, Alaska09-03 20:40
  5. 4.0Nikolski, Alaska09-04 14:39
  6. 4.0Nikolski, Alaska09-08 23:02
  7. 4.0Nikolski, Alaska09-19 12:44
  8. 4.0Fox Islands, Aleutian Islands09-26 21:31
  9. 3.9Nikolski, Alaska09-04 02:06
  10. 3.9Nikolski, Alaska09-06 15:28
  11. 3.8Nikolski, Alaska09-03 20:31
  12. 3.8Nikolski, Alaska09-04 01:50
  13. 3.8Nikolski, Alaska09-06 04:22
  14. 3.8Nikolski, Alaska09-18 01:07
  15. 3.7Nikolski, Alaska09-03 18:33
  16. 3.7Nikolski, Alaska09-03 20:14
  17. 3.7Nikolski, Alaska09-04 03:34
  18. 3.6Nikolski, Alaska09-09 00:23
  19. 3.5Nikolski, Alaska09-04 04:38
  20. 3.5Nikolski, Alaska09-04 09:25
  21. 3.4Nikolski, Alaska09-03 18:57
  22. 3.4Nikolski, Alaska09-08 18:00
  23. 3.4Nikolski, Alaska09-11 02:53
  24. 3.3Nikolski, Alaska09-03 22:42
  25. 3.3Nikolski, Alaska09-03 22:54

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 us7000te45. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000te45). Cite as: SeismoAtlas, “M3.1 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000te45-m3-1-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000te45. SeismoAtlas is not an official warning service.