Alaska earthquakes

M2.5 earthquake 200 km S of Adak, Alaska

A magnitude 2.5 earthquake struck 200 km S of Adak, Alaska on Sat, Nov 4, 2023, 12:39 AM HADT (09:39 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.8 177 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
2.5 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2023-11-04 09:39:06 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.106° N, 176.078° 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
2.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.115 · 10 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 4.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
282°, poorly surrounded by stations
Stations used
10

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 3.2201 km SSW of Atka, Alaska · 1062 days ago · 24 km deep · 94 km away
  2. 2.6175 km S of Adak, Alaska · 1051 days ago · 10 km deep · 25 km away
  3. 3.2198 km SE of Adak, Alaska · 1045 days ago · 10 km deep · 91 km away
  4. 3.1213 km S of Adak, Alaska · 1042 days ago · 10 km deep · 70 km away
  5. 2.5181 km S of Adak, Alaska · 1039 days ago · 10 km deep · 19 km away
  6. 2.3129 km SSE of Adak, Alaska · 1037 days ago · 29 km deep · 89 km away
  7. 3.8177 km SSE of Adak, Alaska · 1033 days ago · 10 km deep · 67 km away
  8. 2.3224 km SSE of Adak, Alaska · 1016 days ago · 10 km deep · 84 km away
  9. 3.3145 km SSW of Adak, Alaska · 1008 days ago · 10 km deep · 88 km away

Before

  1. 2.1207 km SSE of Adak, Alaska · 1068 days ago · 12 km deep · 66 km away
  2. 2.8171 km S of Adak, Alaska · 1070 days ago · 10 km deep · 39 km away
  3. 3.6184 km S of Adak, Alaska · 1076 days ago · 10 km deep · 55 km away
  4. 3.0202 km SSE of Adak, Alaska · 1095 days ago · 10 km deep · 74 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000lqww (also filed as ak023e5j463i). Read Mon, Oct 5, 2026, 8:36 AM UTC.