M4.5 earthquake 187 km WSW of Adak, Alaska
A magnitude 4.5 earthquake struck 187 km WSW of Adak, Alaska on Sun, Aug 26, 1973, 8:45 PM GMT-10 (06:45 UTC), 62 km (39 mi) below the surface.
A larger quake followed: M4.9 190 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
- 4.5 (mb), light
- Local time
- UTC
- 1973-08-27 06:45:44 UTC
- Depth
- 62.0 km (38.5 mi), shallow
- Epicenter
- 51.107° N, 179.044° 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
- 22
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.5202 km WSW of Adak, Alaska · 19384 days ago · 60 km deep · 20 km away
- 4.9190 km WSW of Adak, Alaska · 19373 days ago · 54 km deep · 25 km away
Before
- 4.6193 km WSW of Adak, Alaska · 19385 days ago · 51 km deep · 25 km away
- 4.5191 km WSW of Adak, Alaska · 19385 days ago · 53 km deep · 19 km away
- 5.2129 km WSW of Adak, Alaska · 19385 days ago · 59 km deep · 60 km away
- 5.3195 km WSW of Adak, Alaska · 19385 days ago · 48 km deep · 21 km away
- 4.6104 km WSW of Adak, Alaska · 19405 days ago · 55 km deep · 84 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000383. Read Tue, Sep 22, 2026, 6:31 PM UTC.