M4.0 earthquake 48 km NW of Adak, Alaska
A magnitude 4.0 earthquake struck 48 km NW of Adak, Alaska on Tue, Apr 10, 1973, 8:01 AM GMT-11 (19:01 UTC), 217 km (135 mi) below the surface.
A larger quake followed: M4.6 19 km S 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
- 4.0 (mb), light
- Local time
- UTC
- 1973-04-10 19:01:03 UTC
- Depth
- 217.0 km (134.8 mi), intermediate-depth
- Epicenter
- 52.213° N, 177.082° 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
- 14
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 3.687 km NE of Adak, Alaska · 19516 days ago · 178 km deep · 92 km away
- 3.780 km NE of Adak, Alaska · 19511 days ago · 167 km deep · 88 km away
- 4.619 km S of Adak, Alaska · 19488 days ago · 56 km deep · 63 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00001bc. Read Sun, Sep 27, 2026, 10:26 PM UTC.