Alaska earthquakes

M4.0 earthquake 248 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 248 km WSW of Adak, Alaska on Sun, Apr 22, 1973, 9:44 AM GMT-12 (21:44 UTC), 45 km (28 mi) below the surface.

A larger quake followed: M4.1 248 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.0 (mb), light
Local time
UTC
1973-04-22 21:44:55 UTC
Depth
45.0 km (28.0 mi), shallow
Epicenter
50.960° N, 179.898° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

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. 4.1248 km WSW of Adak, Alaska · 19510 days ago · 42 km deep · 8 km away
  2. 3.7186 km SW of Adak, Alaska · 19504 days ago · 33 km deep · 86 km away
  3. 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 53 km away
  4. 5.8222 km WSW of Adak, Alaska · 19477 days ago · 39 km deep · 47 km away
  5. 4.9221 km WSW of Adak, Alaska · 19477 days ago · 56 km deep · 38 km away
  6. 4.1239 km WSW of Adak, Alaska · 19474 days ago · 46 km deep · 24 km away
  7. 5.8201 km WSW of Adak, Alaska · 19457 days ago · 48 km deep · 52 km away
  8. 5.4204 km WSW of Adak, Alaska · 19457 days ago · 50 km deep · 48 km away
  9. 4.4190 km WSW of Adak, Alaska · 19456 days ago · 51 km deep · 67 km away

Before

  1. 4.8237 km WSW of Adak, Alaska · 19511 days ago · 54 km deep · 19 km away
  2. 3.9263 km WSW of Adak, Alaska · 19516 days ago · 66 km deep · 65 km away
  3. 5.5173 km WSW of Adak, Alaska · 19517 days ago · 54 km deep · 77 km away
  4. 3.8224 km W of Adak, Alaska · 19521 days ago · 111 km deep · 83 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00001gx. Read Tue, Sep 22, 2026, 9:38 AM UTC.