M3.5 earthquake 28 km WNW of Willow, Alaska
A magnitude 3.5 earthquake struck 28 km WNW of Willow, Alaska on Thu, Apr 17, 1975, 11:52 PM GMT-9 (08:52 UTC), 41 km (25 mi) below the surface.
A larger quake followed: M4.3 11 km E of Susitna North, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.5 (mb), minor
- Local time
- UTC
- 1975-04-18 08:52:32 UTC
- Depth
- 41.0 km (25.5 mi), shallow
- Epicenter
- 61.813° N, 150.557° 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
- 16
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 3 in the 30 days before it.
After
- 3.17 km WNW of Trapper Creek, Alaska · 18743 days ago · 33 km deep · 59 km away
- 4.311 km E of Susitna North, Alaska · 18731 days ago · 59 km deep · 62 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000ant. Read Tue, Sep 22, 2026, 12:10 PM UTC.