M4.0 earthquake 114 km WSW of Adak, Alaska
A magnitude 4.0 earthquake struck 114 km WSW of Adak, Alaska on Sat, Jan 31, 1981, 2:06 AM GMT-11 (13:06 UTC), 76 km (47 mi) below the surface.
A larger quake followed: M4.7 211 km WSW 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
- 4.0 (mb), light
- Local time
- UTC
- 1981-01-31 13:06:29 UTC
- Depth
- 76.0 km (47.2 mi), intermediate-depth
- Epicenter
- 51.374° N, 178.080° 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.
- Stations used
- 12
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 usp0001bzn. Read Tue, Sep 22, 2026, 3:08 PM UTC.