M4.8 earthquake 289 km WSW of Adak, Alaska
A magnitude 4.8 earthquake struck 289 km WSW of Adak, Alaska on Wed, Aug 12, 1987, 12:13 AM GMT+12 (12:13 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 298 km WSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.8 (mb), light
- Local time
- UTC
- 1987-08-11 12:13:54 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.259° N, 179.303° E
- 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 1.8 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.5267 km W of Adak, Alaska · 14276 days ago · 144 km deep · 94 km away
- 4.3248 km WSW of Adak, Alaska · 14273 days ago · 33 km deep · 85 km away
- 4.9298 km WSW of Adak, Alaska · 14252 days ago · 33 km deep · 22 km away
- 4.5285 km W of Adak, Alaska · 14235 days ago · 33 km deep · 27 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037ey. Read Tue, Sep 22, 2026, 7:49 AM UTC.