Alaska earthquakes

M4.0 earthquake 64 km SSE of Adak, Alaska

A magnitude 4.0 earthquake struck 64 km SSE of Adak, Alaska on Sun, Aug 11, 1996, 7:40 PM HADT (04:40 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.1 38 km SW of Adak, Alaska. This one was a foreshock.

More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1996-08-12 04:40:27 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.324° N, 176.352° 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
4.0mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · 5 stations
4.0mb, body-waveAlaska 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.

Depth from
OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 4.364 km S of Adak, Alaska · 11002 days ago · 33 km deep · 18 km away
  2. 4.261 km SSW of Adak, Alaska · 10996 days ago · 33 km deep · 41 km away
  3. 4.595 km SW of Adak, Alaska · 10994 days ago · 33 km deep · 99 km away
  4. 4.783 km SW of Atka, Alaska · 10994 days ago · 33 km deep · 94 km away
  5. 5.138 km SW of Adak, Alaska · 10994 days ago · 33 km deep · 52 km away
  6. 4.552 km SSW of Adak, Alaska · 10993 days ago · 33 km deep · 39 km away
  7. 4.268 km S of Adak, Alaska · 10992 days ago · 33 km deep · 20 km away
  8. 4.064 km S of Adak, Alaska · 10991 days ago · 33 km deep · 23 km away
  9. 4.163 km S of Adak, Alaska · 10989 days ago · 33 km deep · 25 km away
  10. 4.279 km SSW of Adak, Alaska · 10987 days ago · 33 km deep · 43 km away
  11. 4.274 km SSE of Adak, Alaska · 10980 days ago · 33 km deep · 20 km away
  12. 5.133 km SE of Adak, Alaska · 10980 days ago · 60 km deep · 40 km away
  13. 4.694 km SW of Atka, Alaska · 10969 days ago · 51 km deep · 95 km away
  14. 4.489 km SSE of Adak, Alaska · 10963 days ago · 33 km deep · 27 km away
  15. 4.887 km ESE of Adak, Alaska · 10959 days ago · 33 km deep · 79 km away

Before

  1. 4.2Andreanof Islands, Aleutian Islands, Alaska · 11023 days ago · 33 km deep · 30 km away
  2. 4.157 km SSE of Adak, Alaska · 11023 days ago · 33 km deep · 8 km away
  3. 5.138 km WSW of Adak, Alaska · 11025 days ago · 55 km deep · 68 km away
  4. 5.181 km WSW of Adak, Alaska · 11031 days ago · 33 km deep · 94 km away
  5. 3.893 km SW of Atka, Alaska · 11031 days ago · 33 km deep · 97 km away
  6. 4.382 km S of Adak, Alaska · 11032 days ago · 33 km deep · 22 km away
  7. 4.496 km SSW of Adak, Alaska · 11033 days ago · 33 km deep · 66 km away
  8. 4.074 km SW of Adak, Alaska · 11034 days ago · 33 km deep · 82 km away
  9. 3.995 km S of Adak, Alaska · 11035 days ago · 33 km deep · 40 km away
  10. 5.187 km S of Adak, Alaska · 11036 days ago · 33 km deep · 29 km away
  11. 3.8101 km S of Adak, Alaska · 11036 days ago · 33 km deep · 42 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0007nf3 (also filed as ak996ac6jgb3). Read Thu, Oct 1, 2026, 4:47 AM UTC.