Alaska earthquakes

M4.8 earthquake 237 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 237 km WSW of Adak, Alaska on Sun, Apr 22, 1973, 9:42 AM GMT-12 (21:42 UTC), 54 km (34 mi) below the surface.

A larger quake followed: M5.3 207 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
1973-04-22 21:42:16 UTC
Depth
54.0 km (33.6 mi), shallow
Epicenter
51.129° N, 179.841° 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
45

Nearby

Within 100 km, magnitude 1.8 and up: 10 in the 60 days after this one and 3 in the 30 days before it.

After

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00001gw. Read Tue, Sep 22, 2026, 9:42 AM UTC.