M4.3 earthquake 256 km WSW of Adak, Alaska
A magnitude 4.3 earthquake struck 256 km WSW of Adak, Alaska on Thu, Jul 21, 1983, 6:55 PM GMT-12 (06:55 UTC), 66 km (41 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 1983-07-22 06:55:49 UTC
- Depth
- 66.4 km (41.3 mi), shallow
- Epicenter
- 50.767° N, 179.854° 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
- FROM_LOCATION
Nearby
Within 100 km, magnitude 1.5 and up: 0 in the 60 days after this one and 2 in the 30 days before it.
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001x10. Read Tue, Sep 22, 2026, 8:27 AM UTC.