M3.8 earthquake 179 km WNW of Nikolski, Alaska
A magnitude 3.8 earthquake struck 179 km WNW of Nikolski, Alaska on Wed, Oct 27, 2021, 7:19 AM HADT (16:19 UTC), 253 km (157 mi) below the surface.
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
- 2021-10-27 16:19:50 UTC
- Depth
- 253.3 km (157.4 mi), intermediate-depth
- Epicenter
- 53.543° N, 171.353° W
- Region
- Alaska
- Strongest shaking
- I, not felt shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- I, not felt shaking
- Peak ground acceleration
- 0.0% of gravity
- Peak ground velocity
- -6.3 cm/s
- Map
- Automatic
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 11.3 km horizontally, 9.2 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 105°
- Stations used
- 64
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fp91 (also filed as ak021dsev8e3). Read Mon, Sep 28, 2026, 12:17 AM UTC.