M4.5 earthquake 84 km SE of Atka, Alaska
A magnitude 4.5 earthquake struck 84 km SE of Atka, Alaska on Sat, Apr 27, 1985, 6:56 PM HAST (04:56 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.6 Andreanof Islands, Aleutian Islands, 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
- 1985-04-28 04:56:55 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.603° N, 173.443° 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: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002e86. Read Tue, Sep 22, 2026, 2:37 PM UTC.