M4.2 earthquake 61 km NE of Adak, Alaska
A magnitude 4.2 earthquake struck 61 km NE of Adak, Alaska on Sat, Jun 20, 1981, 5:47 PM GMT-10 (03:47 UTC), 164 km (102 mi) below the surface.
A larger quake followed: M5.0 29 km SSW 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
- 1981-06-21 03:47:43 UTC
- Depth
- 163.6 km (101.7 mi), intermediate-depth
- Epicenter
- 52.309° N, 176.078° 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 usp0001e8v. Read Tue, Sep 22, 2026, 7:19 AM UTC.