M4.7 earthquake 67 km SE of Adak, Alaska
A magnitude 4.7 earthquake struck 67 km SE of Adak, Alaska on Thu, Apr 9, 1987, 7:44 AM HADT (16:44 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 61 km SE 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
- 1987-04-09 16:44:22 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.421° N, 175.992° 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 1.7 and up: 8 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.463 km E of Adak, Alaska · 14412 days ago · 33 km deep · 49 km away
- 4.760 km SE of Adak, Alaska · 14385 days ago · 33 km deep · 10 km away
- 5.061 km SE of Adak, Alaska · 14382 days ago · 33 km deep · 13 km away
- 4.774 km SSE of Adak, Alaska · 14376 days ago · 33 km deep · 14 km away
- 4.581 km SSE of Adak, Alaska · 14375 days ago · 33 km deep · 23 km away
- 4.397 km ESE of Adak, Alaska · 14372 days ago · 33 km deep · 48 km away
- 3.697 km SSE of Adak, Alaska · 14372 days ago · 33 km deep · 39 km away
- 5.036 km SE of Adak, Alaska · 14367 days ago · 58 km deep · 31 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000341n. Read Thu, Oct 1, 2026, 1:27 AM UTC.