M4.7 earthquake 278 km WSW of Adak, Alaska
A magnitude 4.7 earthquake struck 278 km WSW of Adak, Alaska on Wed, Jul 8, 1987, 9:00 PM GMT+12 (09:00 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 289 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
- 4.7 (mb), light
- Local time
- UTC
- 1987-07-08 09:00:43 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.238° N, 179.475° 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 1.7 and up: 4 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 usp00036fk. Read Tue, Sep 22, 2026, 7:07 AM UTC.