M4.7 earthquake 139 km SSE of Atka, Alaska
A magnitude 4.7 earthquake struck 139 km SSE of Atka, Alaska on Wed, Apr 6, 1988, 8:05 PM HADT (05:05 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.6 185 km S 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
- 4.7 (mb), light
- Local time
- UTC
- 1988-04-07 05:05:23 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 50.990° N, 173.677° 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: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 5.6185 km S of Atka, Alaska · 13999 days ago · 40 km deep · 80 km away
- 4.9173 km S of Atka, Alaska · 13999 days ago · 40 km deep · 74 km away
- 4.5111 km SSW of Atka, Alaska · 13997 days ago · 33 km deep · 93 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0003es0. Read Tue, Sep 22, 2026, 10:30 PM UTC.