M3.5 earthquake 214 km SSW of Nikolski, Alaska
A magnitude 3.5 earthquake struck 214 km SSW of Nikolski, Alaska on Fri, Sep 24, 2021, 7:58 AM HADT (16:58 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M3.7 198 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
- 3.5 (ml), minor
- Local time
- UTC
- 2021-09-24 16:58:36 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 51.186° N, 170.179° 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 8.3 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- Operator assigned
- Station coverage gap
- 225°, poorly surrounded by stations
- Stations used
- 33
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.7198 km SW of Nikolski, Alaska · 1828 days ago · 43 km deep · 82 km away
- 2.8Fox Islands, Aleutian Islands, Alaska · 1817 days ago · 20 km deep · 95 km away
- 2.5136 km SW of Nikolski, Alaska · 1793 days ago · 19 km deep · 96 km away
- 3.6155 km SW of Nikolski, Alaska · 1784 days ago · 35 km deep · 91 km away
- 3.5197 km SSW of Nikolski, Alaska · 1774 days ago · 10 km deep · 30 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fe5h (also filed as ak021c9ud4rg). Read Sun, Sep 27, 2026, 9:07 PM UTC.