M4.8 earthquake 205 km WSW of Adak, Alaska
A magnitude 4.8 earthquake struck 205 km WSW of Adak, Alaska on Sat, Feb 22, 1975, 8:58 AM GMT-11 (19:58 UTC), 46 km (29 mi) below the surface.
A larger quake followed: M5.1 197 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
- 4.8 (mb), light
- Local time
- UTC
- 1975-02-22 19:58:10 UTC
- Depth
- 46.0 km (28.6 mi), shallow
- Epicenter
- 51.400° N, 179.505° 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
- 40
Nearby
Within 100 km, magnitude 1.8 and up: 10 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.1197 km WSW of Adak, Alaska · 18839 days ago · 62 km deep · 14 km away
- 5.0201 km WSW of Adak, Alaska · 18839 days ago · 55 km deep · 8 km away
- 5.0194 km WSW of Adak, Alaska · 18839 days ago · 50 km deep · 22 km away
- 4.4192 km W of Adak, Alaska · 18838 days ago · 59 km deep · 29 km away
- 4.7186 km WSW of Adak, Alaska · 18837 days ago · 59 km deep · 19 km away
- 4.3205 km WSW of Adak, Alaska · 18815 days ago · 63 km deep · 46 km away
- 4.9218 km WSW of Adak, Alaska · 18814 days ago · 53 km deep · 18 km away
- 5.4211 km WSW of Adak, Alaska · 18814 days ago · 57 km deep · 9 km away
- 4.1224 km WSW of Adak, Alaska · 18813 days ago · 56 km deep · 25 km away
- 4.9117 km WSW of Adak, Alaska · 18801 days ago · 62 km deep · 88 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000a00. Read Tue, Sep 22, 2026, 7:07 AM UTC.