M4.7 earthquake 58 km ESE of Adak, Alaska
A magnitude 4.7 earthquake struck 58 km ESE of Adak, Alaska on Mon, Mar 6, 1978, 7:40 AM GMT-11 (18:40 UTC), 65 km (40 mi) below the surface.
A larger quake followed: M5.2 45 km SE 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
- 4.7 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1978-03-06 18:40:23 UTC
- Depth
- 65.0 km (40.4 mi), shallow
- Epicenter
- 51.761° N, 175.808° 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
- 40
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 usp0000t8t. Read Thu, Oct 1, 2026, 11:36 AM UTC.