M4.0 earthquake Southern Alaska
A magnitude 4.0 earthquake struck in Southern Alaska on Wed, Mar 19, 1975, 4:21 PM GMT-9 (01:21 UTC), 118 km (73 mi) below the surface.
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
- 1975-03-20 01:21:07 UTC
- Depth
- 118.0 km (73.3 mi), intermediate-depth
- Epicenter
- 59.704° N, 153.002° 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
- 17
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.030 km ESE of Pedro Bay, Alaska · 18809 days ago · 95 km deep · 37 km away
- 4.054 km E of Port Alsworth, Alaska · 18769 days ago · 143 km deep · 51 km away
- 3.750 km WNW of Ninilchik, Alaska · 18755 days ago · 129 km deep · 55 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000aaf. Read Tue, Sep 22, 2026, 12:15 PM UTC.