M3.7 earthquake 186 km SW of Adak, Alaska
A magnitude 3.7 earthquake struck 186 km SW of Adak, Alaska on Sat, Apr 28, 1973, 5:55 PM GMT-11 (04:55 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.2 245 km SSW 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
- 3.7 (mb), minor
- Local time
- UTC
- 1973-04-29 04:55:10 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 50.806° N, 178.699° 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
- 7
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
- 4.2245 km SSW of Adak, Alaska · 19502 days ago · 33 km deep · 92 km away
- 5.3207 km WSW of Adak, Alaska · 19493 days ago · 61 km deep · 85 km away
- 5.8222 km WSW of Adak, Alaska · 19477 days ago · 39 km deep · 96 km away
- 4.9221 km WSW of Adak, Alaska · 19477 days ago · 56 km deep · 86 km away
- 4.1239 km WSW of Adak, Alaska · 19475 days ago · 46 km deep · 94 km away
- 5.8201 km WSW of Adak, Alaska · 19457 days ago · 48 km deep · 74 km away
- 5.4204 km WSW of Adak, Alaska · 19457 days ago · 50 km deep · 72 km away
- 4.4190 km WSW of Adak, Alaska · 19456 days ago · 51 km deep · 80 km away
Before
- 4.1248 km WSW of Adak, Alaska · 19511 days ago · 42 km deep · 90 km away
- 4.0248 km WSW of Adak, Alaska · 19511 days ago · 45 km deep · 86 km away
- 4.8237 km WSW of Adak, Alaska · 19511 days ago · 54 km deep · 88 km away
- 5.5173 km WSW of Adak, Alaska · 19517 days ago · 54 km deep · 36 km away
- 5.0134 km WSW of Adak, Alaska · 19528 days ago · 50 km deep · 70 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00001mn. Read Tue, Sep 22, 2026, 9:19 PM UTC.