M4.7 earthquake 140 km WSW of Adak, Alaska
A magnitude 4.7 earthquake struck 140 km WSW of Adak, Alaska on Mon, Jan 31, 1983, 8:57 AM GMT-11 (19:57 UTC), 33 km (21 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
- 1983-01-31 19:57:58 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.298° N, 178.446° 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.
- Depth from
- OPERATOR_ASSIGNED
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
- 4.8128 km SW of Adak, Alaska · 15905 days ago · 33 km deep · 57 km away
- 4.9141 km WSW of Adak, Alaska · 15890 days ago · 58 km deep · 3 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001ss7. Read Tue, Sep 22, 2026, 7:44 AM UTC.