M4.2 earthquake 54 km SSW of Adak, Alaska
A magnitude 4.2 earthquake struck 54 km SSW of Adak, Alaska on Fri, Sep 25, 1981, 12:56 PM GMT-10 (22:56 UTC), 47 km (29 mi) below the surface.
A larger quake followed: M4.5 4 km E 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
- 4.2 (mb), light
- Local time
- UTC
- 1981-09-25 22:56:13 UTC
- Depth
- 47.4 km (29.5 mi), shallow
- Epicenter
- 51.411° N, 176.893° 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.
Nearby
Within 100 km, magnitude 1.5 and up: 2 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 usp0001g3m. Read Mon, Sep 28, 2026, 3:44 PM UTC.