M4.5 earthquake 25 km WNW of Old Harbor, Alaska
A magnitude 4.5 earthquake struck 25 km WNW of Old Harbor, Alaska on Mon, Mar 17, 1975, 11:51 AM GMT-9 (20:51 UTC), 65 km (40 mi) below the surface.
A larger quake followed: M4.7 81 km SSE of Old Harbor, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mb), light
- Local time
- UTC
- 1975-03-17 20:51:17 UTC
- Depth
- 65.0 km (40.4 mi), shallow
- Epicenter
- 57.253° N, 153.722° 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: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000a9f. Read Tue, Sep 22, 2026, 10:29 AM UTC.