M5.5 earthquake 146 km SW of Nikolski, Alaska
A magnitude 5.5 earthquake struck 146 km SW of Nikolski, Alaska on Thu, Jun 10, 1971, 7:28 AM GMT-10 (17:28 UTC), 25 km (16 mi) below the surface.
A larger quake followed: M5.7 158 km SW of Nikolski, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (Mw, moment), moderate
- Magnitude from
- ISC-GEM global catalog
- Local time
- UTC
- 1971-06-10 17:28:35 UTC
- Depth
- 25.0 km (15.5 mi), shallow
- Epicenter
- 52.150° N, 170.586° 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.
- Magnitude uncertainty
- ±0.56
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.4161 km SW of Nikolski, Alaska · 20185 days ago · 24 km deep · 34 km away
- 5.7158 km SW of Nikolski, Alaska · 20161 days ago · 36 km deep · 23 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem783330. Read Thu, Oct 1, 2026, 9:06 PM UTC.