M3.4 earthquake 258 km SSW of Nikolski, Alaska
A magnitude 3.4 earthquake struck 258 km SSW of Nikolski, Alaska on Thu, May 27, 2021, 3:53 AM HADT (12:53 UTC), 16 km (10 mi) below the surface.
A larger quake followed: M3.8 223 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
- 3.4 (ml), minor
- Local time
- UTC
- 2021-05-27 12:53:55 UTC
- Depth
- 15.8 km (9.8 mi), shallow
- Epicenter
- 50.901° N, 170.674° 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.
- Location uncertainty
- About 7.9 km horizontally, 9.5 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 236°, poorly surrounded by stations
- Stations used
- 12
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.8223 km SW of Nikolski, Alaska · 1929 days ago · 29 km deep · 74 km away
- 2.6217 km ESE of Atka, Alaska · 1927 days ago · 10 km deep · 66 km away
- 2.8240 km SSW of Nikolski, Alaska · 1905 days ago · 12 km deep · 37 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000egq4. Read Sun, Sep 27, 2026, 9:45 PM UTC.