M4.2 earthquake 83 km NE of Adak, Alaska
A magnitude 4.2 earthquake struck 83 km NE of Adak, Alaska on Sat, Sep 16, 1978, 1:06 AM GMT-10 (11:06 UTC), 167 km (104 mi) below the surface.
A larger quake followed: M4.6 87 km WSW of Atka, 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
- 1978-09-16 11:06:53 UTC
- Depth
- 167.0 km (103.8 mi), intermediate-depth
- Epicenter
- 52.382° N, 175.735° 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
- 15
Nearby
Within 100 km, magnitude 1.5 and up: 2 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 usp0000wjv. Read Tue, Sep 22, 2026, 10:29 AM UTC.