M3.6 earthquake 87 km NE of Adak, Alaska
A magnitude 3.6 earthquake struck 87 km NE of Adak, Alaska on Sun, Apr 22, 1973, 1:30 PM GMT-11 (00:30 UTC), 178 km (111 mi) below the surface.
A larger quake followed: M4.6 85 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
- 3.6 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1973-04-23 00:30:08 UTC
- Depth
- 178.0 km (110.6 mi), intermediate-depth
- Epicenter
- 52.464° N, 175.787° 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
- 10
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.780 km NE of Adak, Alaska · 19516 days ago · 167 km deep · 8 km away
- 4.685 km ESE of Adak, Alaska · 19488 days ago · 59 km deep · 86 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00001h1. Read Sat, Oct 3, 2026, 1:29 PM UTC.