M4.2 earthquake 28 km ENE of Old Harbor, Alaska
A magnitude 4.2 earthquake struck 28 km ENE of Old Harbor, Alaska on Tue, Jun 20, 1978, 5:37 PM GMT-9 (02:37 UTC), 83 km (52 mi) below the surface.
A larger quake followed: M5.7 101 km SSE of Chiniak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (mb), light
- Local time
- UTC
- 1978-06-21 02:37:55 UTC
- Depth
- 83.0 km (51.6 mi), intermediate-depth
- Epicenter
- 57.291° N, 152.857° 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
- 12
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 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 usp0000v6c. Read Tue, Sep 22, 2026, 8:23 PM UTC.