M4.6 earthquake 85 km ESE of Adak, Alaska
A magnitude 4.6 earthquake struck 85 km ESE of Adak, Alaska on Wed, Aug 11, 1976, 10:43 AM GMT-10 (20:43 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 89 km WNW of Atka, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1976-08-11 20:43:45 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.699° N, 175.422° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 10
Nearby
Within 100 km, magnitude 1.6 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000ht7. Read Tue, Sep 22, 2026, 11:32 PM UTC.