Alaska earthquakes

M4.9 earthquake 196 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 196 km WSW of Adak, Alaska on Thu, Mar 22, 1973, 9:58 AM GMT-11 (20:58 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M5.0 134 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1973-03-22 20:58:36 UTC
Depth
40.0 km (24.9 mi), shallow
Epicenter
51.183° N, 179.236° 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
88

Nearby

Within 100 km, magnitude 1.9 and up: 10 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.2209 km WSW of Adak, Alaska · 19543 days ago · 51 km deep · 13 km away
  2. 5.0134 km WSW of Adak, Alaska · 19529 days ago · 50 km deep · 61 km away
  3. 3.8224 km W of Adak, Alaska · 19523 days ago · 111 km deep · 73 km away
  4. 5.5173 km WSW of Adak, Alaska · 19518 days ago · 54 km deep · 29 km away
  5. 3.9263 km WSW of Adak, Alaska · 19518 days ago · 66 km deep · 85 km away
  6. 4.8237 km WSW of Adak, Alaska · 19512 days ago · 54 km deep · 43 km away
  7. 4.0248 km WSW of Adak, Alaska · 19512 days ago · 45 km deep · 52 km away
  8. 4.1248 km WSW of Adak, Alaska · 19512 days ago · 42 km deep · 53 km away
  9. 3.7186 km SW of Adak, Alaska · 19506 days ago · 33 km deep · 56 km away
  10. 5.3207 km WSW of Adak, Alaska · 19494 days ago · 61 km deep · 29 km away

Before

  1. 3.8272 km WSW of Adak, Alaska · 19557 days ago · 38 km deep · 82 km away
  2. 4.6183 km W of Adak, Alaska · 19558 days ago · 103 km deep · 78 km away
  3. 4.3183 km WSW of Adak, Alaska · 19564 days ago · 47 km deep · 20 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000113. Read Wed, Sep 23, 2026, 9:23 PM UTC.