M4.2 earthquake 171 km ENE of Atka, Alaska
A magnitude 4.2 earthquake struck 171 km ENE of Atka, Alaska on Sun, Nov 23, 1975, 2:55 AM GMT-11 (13:55 UTC), 133 km (83 mi) below the surface.
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
- 1975-11-23 13:55:12 UTC
- Depth
- 133.0 km (82.6 mi), intermediate-depth
- Epicenter
- 52.568° N, 171.758° 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.
- Depth from
- CONSTRAINED_BY_DEPTH_PHASES
- Stations used
- 16
Nearby
Within 100 km, magnitude 1.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000dpv. Read Tue, Sep 22, 2026, 10:49 AM UTC.