Alaska earthquakes

M4.5 earthquake 86 km S of Atka, Alaska

A magnitude 4.5 earthquake struck 86 km S of Atka, Alaska on Thu, Sep 25, 2025, 2:40 AM HADT (11:40 UTC), 16 km (10 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
4.5 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-09-25 11:40:29 UTC
Depth
16.0 km (9.9 mi), shallow
Epicenter
51.424° N, 174.387° W
Region
Alaska
Strongest shaking
II, 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
4.5mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.052 · 109 stations
4.1ML, local (Richter)Alaska Earthquake CenterPreliminary

Shaking

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

Strongest estimated
II, weak shaking
Peak ground acceleration
0.1% 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 5.6 km horizontally, 13.3 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
208°, poorly surrounded by stations
Stations used
35

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 21 in the 30 days before it.

After

  1. 2.230 km E of Atka, Alaska · 370 days ago · 7 km deep · 97 km away
  2. 3.983 km SW of Atka, Alaska · 369 days ago · 35 km deep · 58 km away
  3. 2.155 km SSW of Atka, Alaska · 367 days ago · 63 km deep · 32 km away
  4. 4.4100 km SW of Atka, Alaska · 359 days ago · 35 km deep · 62 km away
  5. 1.989 km ESE of Adak, Alaska · 349 days ago · 19 km deep · 76 km away
  6. 3.679 km WSW of Atka, Alaska · 336 days ago · 60 km deep · 72 km away
  7. 4.098 km ESE of Adak, Alaska · 327 days ago · 41 km deep · 64 km away
  8. 3.8113 km SSW of Atka, Alaska · 325 days ago · 10 km deep · 34 km away
  9. 2.6101 km SW of Atka, Alaska · 323 days ago · 10 km deep · 47 km away
  10. 3.198 km ESE of Adak, Alaska · 317 days ago · 35 km deep · 65 km away
  11. 2.974 km E of Adak, Alaska · 316 days ago · 27 km deep · 90 km away
  12. 2.371 km E of Adak, Alaska · 316 days ago · 70 km deep · 93 km away

Before

  1. 3.844 km SE of Atka, Alaska · 383 days ago · 41 km deep · 75 km away
  2. 1.518 km SW of Atka, Alaska · 386 days ago · 9 km deep · 75 km away
  3. 3.260 km ESE of Atka, Alaska · 387 days ago · 72 km deep · 88 km away
  4. 2.582 km ESE of Adak, Alaska · 394 days ago · 50 km deep · 81 km away
  5. 2.7136 km SSE of Atka, Alaska · 394 days ago · 20 km deep · 76 km away
  6. 1.585 km WSW of Atka, Alaska · 394 days ago · 17 km deep · 97 km away
  7. 2.139 km S of Atka, Alaska · 395 days ago · 68 km deep · 47 km away
  8. 2.5167 km S of Atka, Alaska · 395 days ago · 10 km deep · 83 km away
  9. 2.7102 km SSE of Atka, Alaska · 395 days ago · 35 km deep · 41 km away
  10. 4.7107 km S of Atka, Alaska · 395 days ago · 13 km deep · 37 km away
  11. 3.7111 km S of Atka, Alaska · 396 days ago · 10 km deep · 36 km away
  12. 3.4108 km SSE of Atka, Alaska · 396 days ago · 35 km deep · 40 km away
  13. 4.598 km S of Atka, Alaska · 397 days ago · 10 km deep · 33 km away
  14. 3.066 km S of Atka, Alaska · 397 days ago · 24 km deep · 22 km away
  15. 4.080 km SSE of Atka, Alaska · 397 days ago · 35 km deep · 30 km away
  16. 3.788 km S of Atka, Alaska · 397 days ago · 35 km deep · 19 km away
  17. 2.7105 km SW of Atka, Alaska · 398 days ago · 35 km deep · 49 km away
  18. 2.147 km ESE of Atka, Alaska · 400 days ago · 54 km deep · 82 km away
  19. 1.989 km SW of Atka, Alaska · 400 days ago · 41 km deep · 67 km away
  20. 2.162 km ESE of Atka, Alaska · 401 days ago · 65 km deep · 97 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rcsq (also filed as ak025cbetfcp). Read Fri, Oct 2, 2026, 9:58 AM UTC.