Alaska earthquakes

M4.9 earthquake 128 km SE of Old Harbor, Alaska

A magnitude 4.9 earthquake struck 128 km SE of Old Harbor, Alaska on Mon, Sep 1, 2025, 3:45 AM AKDT (11:45 UTC), 11 km (7 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
4.9 (Mww, W-phase moment), light
Magnitude from
Alaska Earthquake Center
Local time
UTC
2025-09-01 11:45:47 UTC
Depth
10.5 km (6.5 mi), shallow
Epicenter
56.289° N, 152.031° 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
4.9Mww, W-phase momentAlaska Earthquake CenterPreferred · Preliminary
4.9Mww, W-phase momentUSGS National Earthquake Information CenterReviewed · ±0.058 · 29 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
0.2% 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting
Oblique reverse
Moment magnitude
4.9 Mww
Nodal plane 1
Strike 260°, dip 9°, rake 129°
Nodal plane 2
Strike 41°, dip 83°, rake 84°

How well it is located

Reviewed by a seismologist.

Stations used
191

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.9 and up: 38 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 2.6120 km SSE of Old Harbor, Alaska · 397 days ago · 11 km deep · 12 km away
  2. 2.138 km SE of Old Harbor, Alaska · 397 days ago · 10 km deep · 89 km away
  3. 3.3127 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 1 km away
  4. 3.2124 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 7 km away
  5. 3.2113 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 16 km away
  6. 3.2133 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 5 km away
  7. 2.988 km SSE of Old Harbor, Alaska · 397 days ago · 11 km deep · 41 km away
  8. 4.5137 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 14 km away · felt by 1
  9. 2.9102 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 41 km away
  10. 2.4122 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 15 km away
  11. 3.3129 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 13 km away
  12. 4.2142 km SSE of Old Harbor, Alaska · 397 days ago · 18 km deep · 19 km away · felt by 1
  13. 4.6125 km SSE of Old Harbor, Alaska · 397 days ago · 11 km deep · 9 km away
  14. 2.7116 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 22 km away
  15. 2.4112 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 19 km away
  16. 2.044 km S of Old Harbor, Alaska · 397 days ago · 26 km deep · 92 km away
  17. 3.0126 km SSE of Old Harbor, Alaska · 397 days ago · 10 km deep · 8 km away
  18. 2.4105 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 22 km away
  19. 2.498 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 33 km away
  20. 2.2104 km SE of Old Harbor, Alaska · 396 days ago · 12 km deep · 24 km away
  21. 2.8112 km SE of Old Harbor, Alaska · 396 days ago · 12 km deep · 17 km away
  22. 2.3133 km SE of Old Harbor, Alaska · 396 days ago · 24 km deep · 7 km away
  23. 2.297 km SE of Old Harbor, Alaska · 396 days ago · 20 km deep · 31 km away
  24. 2.5127 km SSE of Old Harbor, Alaska · 396 days ago · 21 km deep · 15 km away
  25. 3.1134 km SSE of Old Harbor, Alaska · 396 days ago · 25 km deep · 17 km away
  26. 2.2109 km SE of Old Harbor, Alaska · 395 days ago · 25 km deep · 19 km away
  27. 3.5116 km SSE of Old Harbor, Alaska · 395 days ago · 25 km deep · 17 km away
  28. 3.5116 km SSE of Old Harbor, Alaska · 395 days ago · 5 km deep · 18 km away
  29. 3.3130 km SSE of Old Harbor, Alaska · 395 days ago · 20 km deep · 17 km away
  30. 2.985 km S of Old Harbor, Alaska · 392 days ago · 0 km deep · 68 km away
  31. 3.4112 km SE of Akhiok, Alaska · 390 days ago · 20 km deep · 70 km away
  32. 3.0113 km SSE of Akhiok, Alaska · 390 days ago · 23 km deep · 75 km away
  33. 3.3107 km SE of Akhiok, Alaska · 383 days ago · 18 km deep · 69 km away
  34. 4.6117 km SE of Old Harbor, Alaska · 382 days ago · 12 km deep · 11 km away · tsunami flag
  35. 3.0120 km SE of Old Harbor, Alaska · 382 days ago · 10 km deep · 9 km away
  36. 3.2142 km SE of Old Harbor, Alaska · 382 days ago · 10 km deep · 15 km away
  37. 2.546 km S of Old Harbor, Alaska · 381 days ago · 114 km deep · 91 km away
  38. 2.667 km S of Old Harbor, Alaska · 361 days ago · 129 km deep · 80 km away

Before

  1. 2.278 km SSE of Old Harbor, Alaska · 397 days ago · 11 km deep · 55 km away
  2. 2.8119 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 9 km away
  3. 3.3Kodiak Island region, Alaska · 397 days ago · 12 km deep · 10 km away
  4. 3.2119 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 10 km away
  5. 3.1123 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 7 km away
  6. 4.6116 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 12 km away
  7. 4.7134 km SSE of Old Harbor, Alaska · 397 days ago · 12 km deep · 11 km away
  8. 5.6133 km SE of Old Harbor, Alaska · 397 days ago · 12 km deep · 6 km away · tsunami flag
  9. 2.4146 km SSE of Old Harbor, Alaska · 420 days ago · 25 km deep · 41 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak025b7py6gc (also filed as us7000qt0c). Read Sat, Oct 3, 2026, 9:40 PM UTC.