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SeismoAtlas

M4.8 earthquake – Nikolski, Alaska

A magnitude 4.8 earthquake struck in the Nikolski, Alaska region at 16:11 UTC on 3 Sept 2026, at a depth of 35 km, according to USGS.

Data: USGS · updated 2026-09-28 14:15 UTC · reviewed

Magnitude
4.8light
body-wave magnitude (mb)
Depth
35 km
Status
Reviewed
Origin time
2026-09-03 16:11:25 UTC
Epicentre
52.157° N, 169.321° W

Circles show this event and others within 32 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 97 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 Survey4.8 mb35 km52.16° N, 169.32° W–Reviewed

How big was it?

Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.

It released roughly the energy of 239 t 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 35 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M4.8 releases about 32× the energy of M3.8, and its waves are about 10× taller on a seismogram. Energy: 239 t of TNT vs 7.6 t of TNT.

Each square is the energy of one M3.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

160 later earthquakes within 32 km; the largest was M5.4 25 days ago. 99 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M4.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.072.710
0.324.247
0.582.710
0.683.010
0.712.810
1.132.823
1.493.110
1.812.811
2.383.724
2.472.610
2.522.87
2.575.310
2.702.624
2.763.410
2.922.77
3.093.010
3.192.510
3.232.610
3.274.037
3.953.035
4.063.725
4.165.410
4.185.033
4.343.838
4.484.410
4.702.615
4.762.812
6.422.810
6.472.88
6.503.018
6.513.310
6.692.710
6.723.310
6.832.535
7.023.010
7.182.723
7.242.610
7.332.510
7.722.811
7.762.910
7.842.610
9.072.916
9.302.97
9.443.010
9.603.310
9.642.810
9.653.810
9.802.510
9.913.010
9.933.925
10.132.510
10.172.610
10.222.88
10.473.010
10.663.019
11.352.824
11.393.79
11.492.824
12.032.830
12.463.54
12.912.812
12.992.710
13.282.610
13.432.511
14.012.610
14.672.81
14.932.716
15.232.810
15.752.710
16.122.75
16.352.635
16.542.711
16.802.722
17.233.512
18.213.215
19.432.711
19.862.635
21.962.810
22.474.035
22.693.135
23.372.910
25.302.625
33.823.129
34.773.217
35.083.010
35.532.810
35.982.535
36.122.727
38.112.710
40.962.714
41.792.720
44.262.810
44.732.87
46.643.07
47.972.75
48.053.020
49.814.929
50.002.820
56.922.88
60.183.825
60.252.922
60.982.810
63.632.821
64.872.91
67.112.917
68.322.818
70.793.110
71.283.910
77.052.711
78.482.711
79.492.76
79.682.813
82.283.210
83.132.612
89.062.711
90.592.85
92.093.218
92.902.713
93.062.722
94.112.735
110.663.015
112.033.28
112.092.95
121.743.210
121.813.410
122.262.610
122.682.710
125.932.914
126.854.046
126.883.38
126.962.77
127.113.09
127.272.713
128.192.712
128.213.650
132.342.611
154.312.511
168.142.735
178.703.411
182.172.98
183.212.718
183.312.719
191.992.614
194.233.135
218.093.335
223.072.539
239.732.85
244.492.716
244.852.935
270.682.710
280.532.98
289.572.952
289.822.818
329.012.714
344.943.825
357.133.245
380.544.041
397.763.211
397.822.910
557.334.035
  1. 5.4Nikolski, Alaska09-03 20:21
  2. 5.3Nikolski, Alaska09-03 18:45
  3. 5.0Nikolski, Alaska09-03 20:22
  4. 4.9Nikolski, Alaska09-05 18:00
  5. 4.4Nikolski, Alaska09-03 20:40
  6. 4.2Nikolski, Alaska09-03 16:30
  7. 4.0Nikolski, Alaska09-03 19:27
  8. 4.0Nikolski, Alaska09-04 14:39
  9. 4.0Nikolski, Alaska09-08 23:02
  10. 4.0Nikolski, Alaska09-19 12:44
  11. 4.0Fox Islands, Aleutian Islands09-26 21:31
  12. 3.9Nikolski, Alaska09-04 02:06
  13. 3.9Nikolski, Alaska09-06 15:28
  14. 3.8Nikolski, Alaska09-03 20:31
  15. 3.8Nikolski, Alaska09-04 01:50
  16. 3.8Nikolski, Alaska09-06 04:22
  17. 3.8Nikolski, Alaska09-18 01:07
  18. 3.7Nikolski, Alaska09-03 18:33
  19. 3.7Nikolski, Alaska09-03 20:14
  20. 3.7Nikolski, Alaska09-04 03:34
  21. 3.6Nikolski, Alaska09-09 00:23
  22. 3.5Nikolski, Alaska09-04 04:38
  23. 3.5Nikolski, Alaska09-04 09:25
  24. 3.4Nikolski, Alaska09-03 18:57
  25. 3.4Nikolski, Alaska09-08 18:00

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 us7000te09. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000te09). Cite as: SeismoAtlas, “M4.8 earthquake – Nikolski, Alaska”, https://seismoatlas.com/earthquake/us7000te09-m4-8-earthquake-nikolski-alaska, data from USGS.

JSON: /api/v1/events/us7000te09. SeismoAtlas is not an official warning service.