M4.1 earthquake 40 km S of Unalaska, Alaska
A magnitude 4.1 earthquake struck 40 km S of Unalaska, Alaska on Thu, Dec 11, 1975, 4:42 AM GMT-10 (14:42 UTC), 53 km (33 mi) below the surface.
A larger quake followed: M5.2 110 km S of Unalaska, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.1 (mb), light
- Local time
- UTC
- 1975-12-11 14:42:31 UTC
- Depth
- 53.0 km (32.9 mi), shallow
- Epicenter
- 53.509° N, 166.608° 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.
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.2110 km S of Unalaska, Alaska · 18524 days ago · 40 km deep · 69 km away
- 3.739 km S of Unalaska, Alaska · 18505 days ago · 104 km deep · 8 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000dw2. Read Tue, Sep 22, 2026, 3:07 PM UTC.