Alaska earthquakes

M4.0 earthquake 75 km SE of Adak, Alaska

A magnitude 4.0 earthquake struck 75 km SE of Adak, Alaska on Thu, Oct 1, 2026, 9:02 PM HADT (06:02 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M4.1 34 km S of Adak, Alaska. This one was a foreshock.

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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
4.0 (ML, local (Richter)), light
Magnitude from
Alaska Earthquake Center
Local time
UTC
2026-10-02 06:02:57 UTC
Depth
17.3 km (10.7 mi), shallow
Epicenter
51.328° N, 175.993° W
Region
Alaska
Strongest shaking
III, weak shaking
Tsunami flag
No
Status
Reviewed by a seismologist

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 4.7 km horizontally, 3.1 km in depth
Magnitude uncertainty
±0.20
Station coverage gap
222°, poorly surrounded by stations
Stations used
36

Nearby

Within 100 km, magnitude 1.5 and up: 2 since this one and 114 in the 30 days before it.

After

  1. 1.826 km W of Adak, Alaska · 25 hr ago · -2 km deep · 95 km away
  2. 4.134 km S of Adak, Alaska · 11 hr ago · 49 km deep · 55 km away

Before

  1. 2.067 km E of Adak, Alaska · 5 days ago · 80 km deep · 66 km away
  2. 1.838 km SE of Adak, Alaska · 5 days ago · 62 km deep · 39 km away
  3. 2.168 km SE of Adak, Alaska · 5 days ago · 37 km deep · 13 km away
  4. 2.276 km SSW of Adak, Alaska · 5 days ago · 28 km deep · 73 km away
  5. 2.983 km ESE of Adak, Alaska · 5 days ago · 39 km deep · 35 km away
  6. 2.469 km SSW of Adak, Alaska · 5 days ago · 28 km deep · 63 km away
  7. 3.397 km SSW of Atka, Alaska · 5 days ago · 7 km deep · 76 km away
  8. 1.827 km W of Adak, Alaska · 5 days ago · 5 km deep · 97 km away
  9. 2.972 km SSW of Adak, Alaska · 6 days ago · 26 km deep · 64 km away
  10. 2.674 km SSE of Adak, Alaska · 6 days ago · 16 km deep · 10 km away
  11. 3.074 km SE of Adak, Alaska · 8 days ago · 25 km deep · 10 km away
  12. 2.564 km S of Adak, Alaska · 10 days ago · 38 km deep · 55 km away
  13. 2.174 km S of Adak, Alaska · 11 days ago · 17 km deep · 35 km away
  14. 2.090 km SE of Adak, Alaska · 11 days ago · 29 km deep · 29 km away
  15. 2.777 km SSW of Adak, Alaska · 11 days ago · 19 km deep · 73 km away
  16. 2.073 km SSW of Adak, Alaska · 11 days ago · 37 km deep · 73 km away
  17. 1.839 km SE of Adak, Alaska · 11 days ago · 67 km deep · 39 km away
  18. 1.946 km SSW of Adak, Alaska · 11 days ago · 32 km deep · 59 km away
  19. 2.372 km SSE of Adak, Alaska · 11 days ago · 18 km deep · 4 km away
  20. 2.284 km SE of Adak, Alaska · 11 days ago · 29 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event aka2026tmocjx. Read Sat, Oct 3, 2026, 12:26 PM UTC.