M4.6 earthquake 213 km WSW of Adak, Alaska
A magnitude 4.6 earthquake struck 213 km WSW of Adak, Alaska on Thu, Oct 30, 1975, 1:31 AM GMT-11 (12:31 UTC), 52 km (32 mi) below the surface.
A larger quake followed: M5.0 196 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
- 1975-10-30 12:31:44 UTC
- Depth
- 52.0 km (32.3 mi), shallow
- Epicenter
- 51.072° N, 179.424° 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
- 27
Nearby
Within 100 km, magnitude 1.6 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.0196 km WSW of Adak, Alaska · 18590 days ago · 50 km deep · 32 km away
- 4.5182 km WSW of Adak, Alaska · 18579 days ago · 57 km deep · 39 km away
- 4.5114 km WSW of Adak, Alaska · 18548 days ago · 66 km deep · 99 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000dbg. Read Tue, Sep 22, 2026, 7:01 AM UTC.