M4.7 earthquake 93 km SE of Atka, Alaska
A magnitude 4.7 earthquake struck 93 km SE of Atka, Alaska on Fri, Jul 31, 1987, 5:43 PM HADT (02:43 UTC), 33 km (21 mi) below the surface.
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
- 1987-08-01 02:43:16 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.693° N, 173.115° 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: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000374c. Read Tue, Sep 22, 2026, 8:11 AM UTC.