M4.8 earthquake 46 km SSE of Adak, Alaska
A magnitude 4.8 earthquake struck 46 km SSE of Adak, Alaska on Fri, Mar 13, 1987, 9:50 AM HAST (19:50 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 26 km E 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
- 1987-03-13 19:50:19 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.502° N, 176.315° 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
Nearby
Within 100 km, magnitude 1.8 and up: 3 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.126 km E of Adak, Alaska · 14423 days ago · 65 km deep · 44 km away
- 4.767 km SE of Adak, Alaska · 14419 days ago · 33 km deep · 24 km away
- 4.463 km E of Adak, Alaska · 14412 days ago · 33 km deep · 55 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000339s. Read Thu, Oct 1, 2026, 12:36 AM UTC.