M4.0 earthquake 37 km SSE of Adak, Alaska
A magnitude 4.0 earthquake struck 37 km SSE of Adak, Alaska on Thu, Aug 16, 1973, 4:34 AM GMT-10 (14:34 UTC), 55 km (34 mi) below the surface.
A larger quake followed: M4.1 61 km SSE 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
- 4.0 (mb), light
- Local time
- UTC
- 1973-08-16 14:34:56 UTC
- Depth
- 55.0 km (34.2 mi), shallow
- Epicenter
- 51.579° N, 176.379° 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
- 13
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.161 km SSE of Adak, Alaska · 19395 days ago · 47 km deep · 28 km away
- 4.661 km S of Adak, Alaska · 19395 days ago · 53 km deep · 34 km away
- 4.954 km S of Adak, Alaska · 19394 days ago · 51 km deep · 27 km away
- 4.779 km SE of Adak, Alaska · 19384 days ago · 40 km deep · 43 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000033h. Read Tue, Sep 22, 2026, 11:13 AM UTC.