Alaska earthquakes

M3.8 earthquake 224 km W of Adak, Alaska

A magnitude 3.8 earthquake struck 224 km W of Adak, Alaska on Wed, Apr 11, 1973, 6:41 PM GMT-11 (05:41 UTC), 111 km (69 mi) below the surface.

A larger quake followed: M5.5 173 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
3.8 (mb), minor
Local time
UTC
1973-04-12 05:41:42 UTC
Depth
111.0 km (69.0 mi), intermediate-depth
Epicenter
51.710° N, 179.873° 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
13

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 5.5173 km WSW of Adak, Alaska · 19517 days ago · 54 km deep · 97 km away
  2. 3.9263 km WSW of Adak, Alaska · 19516 days ago · 66 km deep · 45 km away
  3. 4.8237 km WSW of Adak, Alaska · 19511 days ago · 54 km deep · 65 km away
  4. 4.0248 km WSW of Adak, Alaska · 19511 days ago · 45 km deep · 83 km away
  5. 4.1248 km WSW of Adak, Alaska · 19511 days ago · 42 km deep · 77 km away
  6. 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 45 km away
  7. 5.8222 km WSW of Adak, Alaska · 19477 days ago · 39 km deep · 39 km away
  8. 4.9221 km WSW of Adak, Alaska · 19477 days ago · 56 km deep · 50 km away
  9. 4.1239 km WSW of Adak, Alaska · 19474 days ago · 46 km deep · 59 km away

Before

  1. 4.2209 km WSW of Adak, Alaska · 19542 days ago · 51 km deep · 74 km away
  2. 4.9196 km WSW of Adak, Alaska · 19542 days ago · 40 km deep · 73 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00001cb. Read Tue, Sep 22, 2026, 10:16 AM UTC.