M4.7 earthquake 165 km WSW of Adak, Alaska
A magnitude 4.7 earthquake struck 165 km WSW of Adak, Alaska on Thu, Jan 20, 1983, 11:22 AM GMT-11 (22:22 UTC), 67 km (42 mi) below the surface.
A larger quake followed: M4.8 128 km SW 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
- 4.7 (mb), light
- Local time
- UTC
- 1983-01-20 22:22:27 UTC
- Depth
- 66.8 km (41.5 mi), shallow
- Epicenter
- 51.255° N, 178.800° 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 1.7 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.7140 km WSW of Adak, Alaska · 15940 days ago · 33 km deep · 25 km away
- 4.8128 km SW of Adak, Alaska · 15905 days ago · 33 km deep · 76 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001seh. Read Tue, Sep 22, 2026, 9:19 PM UTC.