M4.1 earthquake 67 km E of Port Alsworth, Alaska
A magnitude 4.1 earthquake struck 67 km E of Port Alsworth, Alaska on Wed, Mar 20, 1985, 12:09 AM AKST (09:09 UTC), 126 km (78 mi) below the surface.
A larger quake followed: M4.3 95 km W of Tyonek, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.1 (mb), light
- Local time
- UTC
- 1985-03-20 09:09:53 UTC
- Depth
- 125.5 km (78.0 mi), intermediate-depth
- Epicenter
- 60.220° N, 153.100° 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.
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 1 in the 30 days before it.
After
- 4.395 km W of Tyonek, Alaska · 15150 days ago · 163 km deep · 92 km away
- 4.539 km E of Pedro Bay, Alaska · 15127 days ago · 135 km deep · 53 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002d2b. Read Tue, Sep 22, 2026, 6:58 AM UTC.