M4.5 earthquake 36 km W of Tyonek, Alaska
A magnitude 4.5 earthquake struck 36 km W of Tyonek, Alaska on Thu, Sep 21, 1978, 5:45 AM GMT-9 (14:45 UTC), 81 km (50 mi) below the surface.
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
- 1978-09-21 14:45:19 UTC
- Depth
- 81.0 km (50.3 mi), intermediate-depth
- Epicenter
- 61.108° N, 151.808° 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
- 29
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 usp0000wnm. Read Tue, Sep 22, 2026, 7:09 AM UTC.