M4.9 earthquake 74 km NNE of Adak, Alaska
A magnitude 4.9 earthquake struck 74 km NNE of Adak, Alaska on Mon, Jan 27, 1975, 10:33 AM GMT-11 (21:33 UTC), 150 km (93 mi) below the surface.
A larger quake followed: M5.0 84 km WSW of Atka, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.9 (mb), light
- Local time
- UTC
- 1975-01-27 21:33:32 UTC
- Depth
- 150.0 km (93.2 mi), intermediate-depth
- Epicenter
- 52.488° N, 176.188° 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
- 36
Nearby
Within 100 km, magnitude 1.9 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.185 km E of Adak, Alaska · 18860 days ago · 56 km deep · 92 km away
- 4.482 km WSW of Atka, Alaska · 18847 days ago · 49 km deep · 96 km away
- 5.084 km WSW of Atka, Alaska · 18817 days ago · 48 km deep · 94 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00009q4. Read Tue, Sep 22, 2026, 11:21 AM UTC.