M4.3 earthquake 170 km WSW of Nikolski, Alaska
A magnitude 4.3 earthquake struck 170 km WSW of Nikolski, Alaska on Sat, Sep 12, 1981, 12:08 PM GMT-10 (22:08 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.6 128 km WSW of Nikolski, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 1981-09-12 22:08:46 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 52.517° N, 171.283° 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 1.5 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 usp0001fug. Read Tue, Sep 22, 2026, 8:01 AM UTC.