M4.6 earthquake 60 km SSW of Atka, Alaska
A magnitude 4.6 earthquake struck 60 km SSW of Atka, Alaska on Thu, Aug 27, 1987, 1:15 AM HADT (10:15 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 110 km ESE 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
- 4.6 (mb), light
- Local time
- UTC
- 1987-08-27 10:15:23 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.692° N, 174.544° 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 1.6 and up: 5 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.8110 km ESE of Adak, Alaska · 14266 days ago · 33 km deep · 63 km away
- 4.950 km ESE of Adak, Alaska · 14239 days ago · 67 km deep · 95 km away
- 3.773 km ESE of Adak, Alaska · 14233 days ago · 33 km deep · 82 km away
- 4.7156 km SSW of Atka, Alaska · 14229 days ago · 33 km deep · 97 km away
- 5.388 km E of Adak, Alaska · 14222 days ago · 64 km deep · 57 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037vg. Read Tue, Sep 22, 2026, 11:16 AM UTC.