M4.5 earthquake 179 km SSE of Atka, Alaska
A magnitude 4.5 earthquake struck 179 km SSE of Atka, Alaska on Mon, Apr 6, 1987, 12:16 AM HADT (09:16 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 218 km SSE of Atka, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1987-04-06 09:16:44 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 50.791° N, 172.928° 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 1.5 and up: 1 in the 60 days after this one and 6 in the 30 days before it.
After
Before
- 4.894 km SSE of Atka, Alaska · 14424 days ago · 33 km deep · 86 km away
- 5.0Andreanof Islands, Aleutian Islands, Alaska · 14432 days ago · 33 km deep · 92 km away
- 4.697 km SE of Atka, Alaska · 14432 days ago · 33 km deep · 87 km away
- 4.786 km SSE of Atka, Alaska · 14436 days ago · 33 km deep · 94 km away
- 6.279 km SSE of Atka, Alaska · 14439 days ago · 20 km deep · 100 km away
- 5.184 km SE of Atka, Alaska · 14447 days ago · 33 km deep · 97 km away
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00033yf. Read Fri, Oct 2, 2026, 9:02 AM UTC.