M4.6 earthquake 37 km WSW of Unalaska, Alaska
A magnitude 4.6 earthquake struck 37 km WSW of Unalaska, Alaska on Mon, Aug 31, 1987, 4:55 PM AKDT (00:55 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 41 km WSW 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
- 1987-09-01 00:55:22 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 53.745° N, 167.053° 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: 6 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.941 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 5 km away
- 4.636 km SW of Unalaska, Alaska · 14266 days ago · 33 km deep · 12 km away
- 4.636 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 3 km away
- 4.535 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 7 km away
- 4.765 km WSW of Unalaska, Alaska · 14249 days ago · 33 km deep · 30 km away
- 4.7114 km SSW of Unalaska, Alaska · 14241 days ago · 33 km deep · 94 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037ze. Read Tue, Sep 22, 2026, 10:39 AM UTC.