M4.3 earthquake 63 km W of Atka, Alaska
A magnitude 4.3 earthquake struck 63 km W of Atka, Alaska on Wed, Dec 11, 1985, 1:29 AM HAST (11:29 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 74 km NW 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
- 4.3 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1985-12-11 11:29:31 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 52.186° N, 175.135° 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
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.5114 km SSW of Atka, Alaska · 14904 days ago · 33 km deep · 96 km away
- 4.5Andreanof Islands, Aleutian Islands, Alaska · 14893 days ago · 156 km deep · 38 km away
- 4.874 km NW of Atka, Alaska · 14870 days ago · 159 km deep · 44 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002nrz. Read Thu, Oct 1, 2026, 4:25 PM UTC.