M4.1 earthquake 248 km WSW of Adak, Alaska
A magnitude 4.1 earthquake struck 248 km WSW of Adak, Alaska on Sun, Apr 22, 1973, 10:45 AM GMT-12 (22:45 UTC), 42 km (26 mi) below the surface.
A larger quake followed: M5.3 207 km WSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.1 (mb), light
- Local time
- UTC
- 1973-04-22 22:45:11 UTC
- Depth
- 42.0 km (26.1 mi), shallow
- Epicenter
- 51.021° N, 179.944° 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
- 15
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 5 in the 30 days before it.
After
- 3.7186 km SW of Adak, Alaska · 19505 days ago · 33 km deep · 90 km away
- 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 49 km away
- 5.8222 km WSW of Adak, Alaska · 19477 days ago · 39 km deep · 41 km away
- 4.9221 km WSW of Adak, Alaska · 19477 days ago · 56 km deep · 34 km away
- 4.1239 km WSW of Adak, Alaska · 19475 days ago · 46 km deep · 18 km away
- 5.8201 km WSW of Adak, Alaska · 19457 days ago · 48 km deep · 50 km away
- 5.4204 km WSW of Adak, Alaska · 19457 days ago · 50 km deep · 46 km away
- 4.4190 km WSW of Adak, Alaska · 19456 days ago · 51 km deep · 64 km away
Before
- 4.0248 km WSW of Adak, Alaska · 19511 days ago · 45 km deep · 8 km away
- 4.8237 km WSW of Adak, Alaska · 19511 days ago · 54 km deep · 14 km away
- 3.9263 km WSW of Adak, Alaska · 19517 days ago · 66 km deep · 57 km away
- 5.5173 km WSW of Adak, Alaska · 19517 days ago · 54 km deep · 79 km away
- 3.8224 km W of Adak, Alaska · 19522 days ago · 111 km deep · 77 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00001h0. Read Tue, Sep 22, 2026, 10:24 PM UTC.