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SeismoAtlas

M3.3 earthquake – Adak, Alaska

A magnitude 3.3 earthquake struck in the Adak, Alaska region at 05:07 UTC on 2 Sept 2026, at a depth of 10 km, according to USGS.

Data: USGS · updated 2026-09-09 07:01 UTC · reviewed

Magnitude
3.3minor
local magnitude (Richter) (ml)
Depth
10 km
Status
Reviewed
Origin time
2026-09-02 05:07:21 UTC
Epicentre
51.048° N, 178.479° 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 19 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 Survey3.3 ml10 km51.05° N, 178.48° 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 1.3 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 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M3.3 releases about 32× the energy of M2.3, and its waves are about 10× taller on a seismogram. Energy: 1.3 t of TNT vs 43 kg of TNT.

Each square is the energy of one M2.3. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

24 later earthquakes within 30 km; the largest was M5.3 17 days ago. 1 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.223.310
45.132.924
72.272.616
95.092.51
114.423.45
139.472.825
181.693.216
221.665.341
221.743.119
221.764.314
221.823.120
222.002.720
222.072.524
222.102.530
222.562.517
222.992.535
225.112.635
229.042.521
232.562.615
238.603.519
261.023.939
303.402.542
350.562.520
480.693.50
  1. 5.3Adak, Alaska09-11 10:47
  2. 4.3Adak, Alaska09-11 10:52
  3. 3.9Adak, Alaska09-13 02:08
  4. 3.5Adak, Alaska09-12 03:43
  5. 3.5Adak, Alaska09-22 05:49
  6. 3.4Adak, Alaska09-06 23:32
  7. 3.3Adak, Alaska09-02 06:20
  8. 3.2Adak, Alaska09-09 18:48
  9. 3.1Adak, Alaska09-11 10:51
  10. 3.1Adak, Alaska09-11 10:56
  11. 2.9Adak, Alaska09-04 02:15
  12. 2.8Adak, Alaska09-08 00:35
  13. 2.7Adak, Alaska09-11 11:07
  14. 2.6Adak, Alaska09-05 05:23
  15. 2.6Adak, Alaska09-11 14:14
  16. 2.6Adak, Alaska09-11 21:41
  17. 2.5Adak, Alaska09-06 04:12
  18. 2.5Adak, Alaska09-11 11:11
  19. 2.5Adak, Alaska09-11 11:13
  20. 2.5Adak, Alaska09-11 11:40
  21. 2.5Adak, Alaska09-11 12:06
  22. 2.5Adak, Alaska09-11 18:09
  23. 2.5Adak, Alaska09-14 20:31
  24. 2.5Adak, Alaska09-16 19:40

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 us7000tdiw. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS (usgs:us7000tdiw). Cite as: SeismoAtlas, “M3.3 earthquake – Adak, Alaska”, https://seismoatlas.com/earthquake/us7000tdiw-m3-3-earthquake-adak-alaska, data from USGS.

JSON: /api/v1/events/us7000tdiw. SeismoAtlas is not an official warning service.