M5.2 earthquake 45 km SE of Adak, Alaska
A magnitude 5.2 earthquake struck 45 km SE of Adak, Alaska on Sun, Apr 23, 1978, 5:28 PM GMT-11 (04:28 UTC), 53 km (33 mi) below the surface.
A larger quake followed: M5.9 43 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
- 5.2 (mb), moderate
- Local time
- UTC
- 1978-04-24 04:28:47 UTC
- Depth
- 53.0 km (32.9 mi), shallow
- Epicenter
- 51.645° N, 176.091° 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.
- Stations used
- 188
Nearby
Within 100 km, magnitude 2.2 and up: 3 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000u88 (also filed as gcmtb042478a, gcmt19780424042847, iscgem684151). Read Tue, Sep 22, 2026, 9:10 AM UTC.