Alaska earthquakes

M2.9 earthquake 191 km SSE of Adak, Alaska

A magnitude 2.9 earthquake struck 191 km SSE of Adak, Alaska on Tue, Aug 19, 2025, 3:47 PM HADT (00:47 UTC), 36 km (22 mi) below the surface.

A larger quake followed: M4.0 95 km SSE of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
2.9 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-08-20 00:47:30 UTC
Depth
35.8 km (22.2 mi), shallow
Epicenter
50.361° N, 175.325° W
Region
Alaska
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
2.9ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.115 · 10 stations
2.7ML, local (Richter)Alaska Earthquake CenterPreliminary

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 8.7 km horizontally, 24.2 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
278°, poorly surrounded by stations
Stations used
22

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.5239 km S of Atka, Alaska · 408 days ago · 15 km deep · 57 km away
  2. 2.0171 km S of Adak, Alaska · 408 days ago · 10 km deep · 69 km away
  3. 2.6228 km SSE of Adak, Alaska · 407 days ago · 20 km deep · 41 km away
  4. 2.596 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 97 km away
  5. 2.6107 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 88 km away
  6. 2.894 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 98 km away
  7. 2.9101 km SSE of Adak, Alaska · 402 days ago · 13 km deep · 92 km away
  8. 3.4105 km SSE of Adak, Alaska · 402 days ago · 12 km deep · 91 km away
  9. 2.698 km SSE of Adak, Alaska · 401 days ago · 10 km deep · 95 km away
  10. 2.799 km SSE of Adak, Alaska · 400 days ago · 33 km deep · 95 km away
  11. 2.094 km SSE of Adak, Alaska · 400 days ago · 26 km deep · 99 km away
  12. 2.8213 km SSE of Adak, Alaska · 396 days ago · 10 km deep · 24 km away
  13. 2.5167 km S of Atka, Alaska · 395 days ago · 10 km deep · 87 km away
  14. 4.095 km SSE of Adak, Alaska · 373 days ago · 10 km deep · 97 km away · felt by 1
  15. 3.1250 km SSE of Adak, Alaska · 349 days ago · 10 km deep · 76 km away

Before

  1. 2.5174 km S of Atka, Alaska · 412 days ago · 25 km deep · 89 km away
  2. 2.4185 km S of Adak, Alaska · 419 days ago · 12 km deep · 88 km away
  3. 1.8100 km SSE of Adak, Alaska · 423 days ago · 5 km deep · 93 km away
  4. 1.9124 km SE of Adak, Alaska · 423 days ago · 1 km deep · 71 km away
  5. 2.7159 km SSE of Adak, Alaska · 424 days ago · 10 km deep · 47 km away
  6. 2.9161 km SSW of Atka, Alaska · 427 days ago · 10 km deep · 58 km away
  7. 1.8152 km SE of Adak, Alaska · 430 days ago · 26 km deep · 48 km away
  8. 1.8185 km SSE of Adak, Alaska · 431 days ago · 8 km deep · 19 km away
  9. 2.9121 km SSW of Atka, Alaska · 437 days ago · 10 km deep · 99 km away
  10. 3.3127 km SSW of Atka, Alaska · 437 days ago · 35 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rit8 (also filed as ak025anoynrc). Read Fri, Oct 2, 2026, 9:49 AM UTC.