M4.6 earthquake 57 km SW of Unalaska, Alaska
A magnitude 4.6 earthquake struck 57 km SW of Unalaska, Alaska on Fri, Sep 19, 1986, 6:17 PM AKDT (02:17 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 94 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
- 4.6 (mb), light
- Local time
- UTC
- 1986-09-20 02:17:32 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 53.578° N, 167.249° 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
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 1 in the 60 days after this one and 2 in the 30 days before it.
After
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002y7v. Read Tue, Sep 22, 2026, 8:21 PM UTC.