M3.8 earthquake 190 km WSW of Adak, Alaska
A magnitude 3.8 earthquake struck 190 km WSW of Adak, Alaska on Wed, Oct 22, 1975, 9:22 AM GMT-10 (19:22 UTC), 33 km (21 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
- 3.8 (mb), minor
- Local time
- UTC
- 1975-10-22 19:22:16 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.531° N, 179.334° 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
- OPERATOR_ASSIGNED
- Stations used
- 6
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.6213 km WSW of Adak, Alaska · 18596 days ago · 52 km deep · 51 km away
- 5.0196 km WSW of Adak, Alaska · 18596 days ago · 50 km deep · 19 km away
- 4.5182 km WSW of Adak, Alaska · 18585 days ago · 57 km deep · 21 km away
- 4.5114 km WSW of Adak, Alaska · 18554 days ago · 66 km deep · 84 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000d8f. Read Mon, Sep 28, 2026, 10:15 AM UTC.