Alaska earthquakes

M3.5 earthquake 66 km SE of Atka, Alaska

A magnitude 3.5 earthquake struck 66 km SE of Atka, Alaska on Sat, Oct 3, 2026, 12:25 PM HADT (21:25 UTC), 35 km (22 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.5 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2026-10-03 21:25:25 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.722° N, 173.613° W
Region
Alaska
Strongest shaking
III, weak shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.ScaleComputed byNotes
3.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Preliminary · ±0.081 · 20 stations
3.6ML, local (Richter)Alaska Earthquake CenterPreliminary · ±0.1 · 16 stations

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
III, weak shaking
Peak ground acceleration
0.5% of gravity
Peak ground velocity
0.1 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 5.9 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
204°, poorly surrounded by stations
Stations used
24

Nearby

Within 100 km, magnitude 1.5 and up: 0 since this one and 33 in the 30 days before it.

Before

  1. 2.697 km SSE of Atka, Alaska · 6 days ago · 40 km deep · 43 km away
  2. 2.934 km NW of Atka, Alaska · 6 days ago · 214 km deep · 99 km away
  3. 3.397 km SSW of Atka, Alaska · 6 days ago · 7 km deep · 95 km away
  4. 3.573 km SSW of Atka, Alaska · 7 days ago · 10 km deep · 67 km away
  5. 3.325 km E of Atka, Alaska · 7 days ago · 17 km deep · 58 km away
  6. 1.612 km N of Atka, Alaska · 7 days ago · 15 km deep · 77 km away
  7. 2.439 km SSE of Atka, Alaska · 14 days ago · 93 km deep · 28 km away
  8. 3.6109 km SE of Atka, Alaska · 17 days ago · 35 km deep · 43 km away
  9. 2.555 km SSE of Atka, Alaska · 17 days ago · 53 km deep · 29 km away
  10. 2.570 km SW of Atka, Alaska · 18 days ago · 35 km deep · 86 km away
  11. 2.892 km SSE of Atka, Alaska · 18 days ago · 8 km deep · 33 km away
  12. 2.360 km SE of Atka, Alaska · 21 days ago · 20 km deep · 15 km away
  13. 2.471 km ESE of Atka, Alaska · 21 days ago · 60 km deep · 37 km away
  14. 2.599 km SSE of Atka, Alaska · 21 days ago · 13 km deep · 36 km away
  15. 2.571 km SSW of Atka, Alaska · 22 days ago · 12 km deep · 71 km away
  16. 2.668 km E of Atka, Alaska · 22 days ago · 4 km deep · 59 km away
  17. 3.474 km SE of Atka, Alaska · 22 days ago · 13 km deep · 20 km away
  18. 2.7114 km SE of Atka, Alaska · 23 days ago · 0 km deep · 56 km away
  19. 2.9119 km ESE of Atka, Alaska · 23 days ago · 29 km deep · 74 km away
  20. 3.1118 km ESE of Atka, Alaska · 23 days ago · 11 km deep · 72 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tzfa (also filed as aka2026tpowrn). Read Sun, Oct 4, 2026, 10:34 PM UTC.