Alaska earthquakes

M2.9 earthquake 184 km S of Atka, Alaska

A magnitude 2.9 earthquake struck 184 km S of Atka, Alaska on Wed, Sep 27, 2023, 5:56 AM HADT (14:56 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.2 201 km SSW of Atka, 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
2023-09-27 14:56:11 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.569° N, 173.720° 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 · ±0.105 · 12 stations
2.6ML, 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 6.6 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.10
Depth from
Operator assigned
Station coverage gap
246°, poorly surrounded by stations
Stations used
14

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.8182 km S of Atka, Alaska · 1100 days ago · 10 km deep · 29 km away
  2. 2.8184 km SSE of Atka, Alaska · 1096 days ago · 39 km deep · 51 km away
  3. 2.3100 km SSE of Atka, Alaska · 1095 days ago · 7 km deep · 91 km away
  4. 2.1160 km S of Atka, Alaska · 1087 days ago · 4 km deep · 24 km away
  5. 2.7151 km S of Atka, Alaska · 1078 days ago · 10 km deep · 38 km away
  6. 2.7193 km S of Atka, Alaska · 1075 days ago · 10 km deep · 32 km away
  7. 2.7186 km SE of Atka, Alaska · 1074 days ago · 10 km deep · 84 km away
  8. 2.5179 km S of Atka, Alaska · 1070 days ago · 10 km deep · 26 km away
  9. 2.7164 km SSE of Atka, Alaska · 1067 days ago · 10 km deep · 37 km away
  10. 3.2201 km SSW of Atka, Alaska · 1058 days ago · 24 km deep · 82 km away
  11. 3.1155 km SSE of Atka, Alaska · 1053 days ago · 10 km deep · 63 km away
  12. 2.9169 km S of Atka, Alaska · 1050 days ago · 10 km deep · 25 km away
  13. 3.2198 km SE of Adak, Alaska · 1041 days ago · 10 km deep · 85 km away

Before

  1. 2.3109 km SSE of Atka, Alaska · 1100 days ago · 16 km deep · 77 km away
  2. 2.0109 km S of Atka, Alaska · 1101 days ago · 3 km deep · 77 km away
  3. 2.799 km S of Atka, Alaska · 1103 days ago · 10 km deep · 89 km away
  4. 2.5125 km S of Atka, Alaska · 1105 days ago · 10 km deep · 59 km away
  5. 2.9198 km S of Atka, Alaska · 1113 days ago · 10 km deep · 57 km away
  6. 3.3188 km S of Atka, Alaska · 1118 days ago · 10 km deep · 28 km away
  7. 3.2170 km SSE of Atka, Alaska · 1120 days ago · 10 km deep · 51 km away
  8. 2.1156 km S of Atka, Alaska · 1120 days ago · 15 km deep · 35 km away
  9. 2.6196 km SSE of Atka, Alaska · 1121 days ago · 10 km deep · 13 km away
  10. 2.8169 km SSE of Atka, Alaska · 1122 days ago · 10 km deep · 15 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000lf6m (also filed as ak023cerrt0k). Read Thu, Oct 1, 2026, 4:19 PM UTC.