M4.0 earthquake 138 km W of Adak, Alaska
A magnitude 4.0 earthquake struck 138 km W of Adak, Alaska on Sat, Aug 24, 1974, 8:16 AM GMT-10 (18:16 UTC), 66 km (41 mi) below the surface.
A larger quake followed: M4.4 151 km W 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
- 4.0 (mb), light
- Local time
- UTC
- 1974-08-24 18:16:56 UTC
- Depth
- 66.0 km (41.0 mi), shallow
- Epicenter
- 51.664° N, 178.616° 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
- 9
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.4151 km W of Adak, Alaska · 19025 days ago · 36 km deep · 35 km away
- 4.3174 km WSW of Adak, Alaska · 18991 days ago · 53 km deep · 40 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00007ry. Read Mon, Sep 28, 2026, 7:48 PM UTC.