M3.3 earthquake 127 km N of Tanaina, Alaska, United States
A magnitude 3.3 earthquake struck 127 km N of Tanaina, Alaska, United States at 03:38 local time (11:38 UTC) on 3 Sept 2026, at a depth of 71 km, according to USGS.
Data: USGS · updated 2026-09-25 12:50 UTC · reviewed
- Magnitude
- 3.3minor
local magnitude (Richter) (ml) - Depth
- 71.4 km
- Status
- Reviewed
- Origin time
- 2026-09-03 11:38:02 UTC
- Local: 3 Sept 2026, 03:38:02 (America/Anchorage)
- Epicentre
- 62.772° N, 149.485° 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
| Place | Distance | Est. shaking |
|---|---|---|
| TanainaAlaska, United States · pop. 8,197 | 127 km | INot felt |
| Meadow LakesAlaska, United States · pop. 7,570 | 128 km | INot felt |
| AnchorageAlaska, United States · pop. 289,600 | 174 km | INot felt |
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.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey | 3.3 ml | 71.4 km | 62.77° N, 149.49° W | – | Reviewed |
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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 71 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.
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
6 later earthquakes within 30 km; the largest was M3.9 16 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M3.3
6 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 102.39 | 3.5 | 82 |
| 211.01 | 3.9 | 70 |
| 477.20 | 1.6 | 64 |
| 540.05 | 2.1 | 75 |
| 567.69 | 2.1 | 5 |
| 586.26 | 2.6 | 62 |
- 3.9135 km N of Tanaina, Alaska, United States09-12 06:38
- 3.5Cantwell, Alaska09-07 18:01
- 2.6109 km N of Tanaina, Alaska, United States09-27 21:53
- 2.1123 km N of Tanaina, Alaska, United States09-25 23:41
- 2.1118 km N of Tanaina, Alaska, United States09-27 03:19
- 1.6111 km N of Tanaina, Alaska, United States09-23 08:49
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 aka2026rlkqil. First recorded here 28 Sept 2026, 17:32:13 UTC. Solutions: USGS · AK (usgs:aka2026rlkqil). Cite as: SeismoAtlas, “M3.3 earthquake 127 km N of Tanaina, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026rlkqil-m3-3-earthquake-127-km-n-of-tanaina-alaska-united-states, data from USGS.
JSON: /api/v1/events/aka2026rlkqil. SeismoAtlas is not an official warning service.