M4.5 earthquake 33 km ENE of Adak, Alaska
A magnitude 4.5 earthquake struck 33 km ENE of Adak, Alaska on Tue, Aug 31, 1976, 4:17 PM GMT-10 (02:17 UTC), 116 km (72 mi) below the surface.
A larger quake followed: M5.1 49 km ESE 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
- 1976-09-01 02:17:25 UTC
- Depth
- 116.0 km (72.1 mi), intermediate-depth
- Epicenter
- 51.977° N, 176.171° 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
- 17
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.135 km ESE of Adak, Alaska · 18280 days ago · 53 km deep · 26 km away
- 5.149 km ESE of Adak, Alaska · 18262 days ago · 43 km deep · 32 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000j53. Read Tue, Sep 22, 2026, 10:49 AM UTC.