M4.8 earthquake 250 km W of Adak, Alaska
A magnitude 4.8 earthquake struck 250 km W of Adak, Alaska on Sat, Jun 27, 1981, 12:40 AM GMT+12 (12:40 UTC), 63 km (39 mi) below the surface.
A larger quake followed: M4.9 Rat 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
- 4.8 (mb), light
- Local time
- UTC
- 1981-06-26 12:40:21 UTC
- Depth
- 63.0 km (39.1 mi), shallow
- Epicenter
- 51.595° N, 179.763° E
- 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
- CONSTRAINED_BY_DEPTH_PHASES
Nearby
Within 100 km, magnitude 1.8 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 usp0001ebw. Read Tue, Sep 22, 2026, 10:38 AM UTC.