M4.1 earthquake 172 km W of Adak, Alaska
A magnitude 4.1 earthquake struck 172 km W of Adak, Alaska on Sat, Aug 3, 1974, 7:43 PM GMT-10 (05:43 UTC), 42 km (26 mi) below the surface.
A larger quake followed: M5.8 109 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
- 4.1 (mb), light
- Local time
- UTC
- 1974-08-04 05:43:56 UTC
- Depth
- 42.0 km (26.1 mi), shallow
- Epicenter
- 51.648° N, 179.102° 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
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 0 in the 30 days before it.
After
- 5.8109 km WSW of Adak, Alaska · 19042 days ago · 52 km deep · 70 km away
- 5.7110 km WSW of Adak, Alaska · 19041 days ago · 56 km deep · 67 km away
- 5.892 km WSW of Adak, Alaska · 19038 days ago · 46 km deep · 90 km away
- 4.0138 km W of Adak, Alaska · 19030 days ago · 66 km deep · 34 km away
- 4.4151 km W of Adak, Alaska · 19027 days ago · 36 km deep · 37 km away
- 4.3174 km WSW of Adak, Alaska · 18993 days ago · 53 km deep · 25 km away
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00007fz. Read Wed, Sep 30, 2026, 8:01 PM UTC.