M4.8 earthquake 130 km WSW of Adak, Alaska
A magnitude 4.8 earthquake struck 130 km WSW of Adak, Alaska on Tue, Mar 10, 1987, 10:31 PM HAST (08:31 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M6.4 65 km WNW 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
- 1987-03-11 08:31:51 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.408° N, 178.364° 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
Nearby
Within 100 km, magnitude 1.8 and up: 4 in the 60 days after this one and 2 in the 30 days before it.
After
- 6.465 km WNW of Adak, Alaska · 14438 days ago · 93 km deep · 91 km away
- 4.869 km WNW of Adak, Alaska · 14438 days ago · 103 km deep · 92 km away
- 5.1130 km WSW of Adak, Alaska · 14432 days ago · 33 km deep · 14 km away
- 4.3190 km WSW of Adak, Alaska · 14414 days ago · 33 km deep · 63 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000336q. Read Wed, Sep 30, 2026, 1:46 PM UTC.