M3.4 earthquake 40 km W of Cohoe, Alaska
A magnitude 3.4 earthquake struck 40 km W of Cohoe, Alaska on Wed, May 21, 1975, 1:35 AM GMT-9 (10:35 UTC), 92 km (57 mi) below the surface.
A larger quake followed: M3.8 22 km W of Happy Valley, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.4 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1975-05-21 10:35:26 UTC
- Depth
- 92.0 km (57.2 mi), intermediate-depth
- Epicenter
- 60.431° N, 152.026° 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
- 21
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 3.526 km W of Nikiski, Alaska · 18737 days ago · 115 km deep · 35 km away
- 3.822 km W of Happy Valley, Alaska · 18737 days ago · 96 km deep · 52 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000b3z. Read Sun, Oct 4, 2026, 6:50 AM UTC.