Alaska earthquakes

M5.0 earthquake 134 km WSW of Adak, Alaska

A magnitude 5.0 earthquake struck 134 km WSW of Adak, Alaska on Thu, Apr 5, 1973, 2:46 PM GMT-11 (01:46 UTC), 50 km (31 mi) below the surface.

A larger quake followed: M5.8 222 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.0 (mb, body-wave), moderate
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1973-04-06 01:46:18 UTC
Depth
50.0 km (31.1 mi), shallow
Epicenter
51.416° N, 178.438° 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
48

Nearby

Within 100 km, magnitude 2.0 and up: 5 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 5.5173 km WSW of Adak, Alaska · 19527 days ago · 54 km deep · 42 km away
  2. 3.7186 km SW of Adak, Alaska · 19514 days ago · 33 km deep · 70 km away
  3. 5.3207 km WSW of Adak, Alaska · 19503 days ago · 61 km deep · 75 km away
  4. 5.8222 km WSW of Adak, Alaska · 19487 days ago · 39 km deep · 91 km away
  5. 4.9221 km WSW of Adak, Alaska · 19487 days ago · 56 km deep · 88 km away

Before

  1. 5.253 km W of Adak, Alaska · 19540 days ago · 63 km deep · 92 km away
  2. 4.2209 km WSW of Adak, Alaska · 19551 days ago · 51 km deep · 74 km away
  3. 4.9196 km WSW of Adak, Alaska · 19551 days ago · 40 km deep · 61 km away
  4. 4.6183 km W of Adak, Alaska · 19566 days ago · 103 km deep · 79 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000018y. Read Fri, Oct 2, 2026, 3:29 AM UTC.