M3.9 earthquake 43 km W of Atka, Alaska
A magnitude 3.9 earthquake struck 43 km W of Atka, Alaska on Sun, Feb 24, 1985, 12:48 PM HAST (22:48 UTC), 204 km (127 mi) below the surface.
A larger quake followed: M4.4 34 km SSE 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
- 3.9 (mb), minor
- Local time
- UTC
- 1985-02-24 22:48:07 UTC
- Depth
- 204.4 km (127.0 mi), intermediate-depth
- Epicenter
- 52.242° N, 174.837° 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
- FROM_LOCATION
Nearby
Within 100 km, magnitude 1.5 and up: 1 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 usp0002c71. Read Tue, Sep 22, 2026, 3:49 PM UTC.