M4.7 earthquake 72 km SW of Unalaska, Alaska
A magnitude 4.7 earthquake struck 72 km SW of Unalaska, Alaska on Wed, Aug 26, 1987, 5:13 PM AKDT (01:13 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 45 km WSW of Dutch Harbor, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1987-08-27 01:13:34 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 53.453° N, 167.364° 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 1.7 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.045 km WSW of Dutch Harbor, Alaska · 14266 days ago · 33 km deep · 37 km away
- 4.637 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 38 km away
- 4.941 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 36 km away
- 4.636 km SW of Unalaska, Alaska · 14266 days ago · 33 km deep · 35 km away
- 4.636 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 40 km away
- 4.535 km WSW of Unalaska, Alaska · 14266 days ago · 33 km deep · 37 km away
- 4.765 km WSW of Unalaska, Alaska · 14249 days ago · 33 km deep · 11 km away
- 4.7114 km SSW of Unalaska, Alaska · 14241 days ago · 33 km deep · 65 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037v2. Read Tue, Sep 22, 2026, 4:05 AM UTC.