M4.6 earthquake 173 km WSW of Adak, Alaska
A magnitude 4.6 earthquake struck 173 km WSW of Adak, Alaska on Fri, Jun 23, 1978, 3:20 PM GMT-10 (01:20 UTC), 66 km (41 mi) below the surface.
A larger quake followed: M4.9 176 km WSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1978-06-24 01:20:42 UTC
- Depth
- 66.0 km (41.0 mi), shallow
- Epicenter
- 51.278° N, 178.946° 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
- 46
Nearby
Within 100 km, magnitude 1.6 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.9176 km WSW of Adak, Alaska · 17608 days ago · 67 km deep · 3 km away
- 4.4156 km WSW of Adak, Alaska · 17604 days ago · 56 km deep · 36 km away
- 3.9159 km WSW of Adak, Alaska · 17596 days ago · 68 km deep · 27 km away
- 4.9124 km WSW of Adak, Alaska · 17595 days ago · 54 km deep · 49 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000v8v. Read Tue, Sep 22, 2026, 3:16 PM UTC.