M2.7 earthquake 221 km SW of Nikolski, Alaska
A magnitude 2.7 earthquake struck 221 km SW of Nikolski, Alaska on Sat, Apr 17, 2021, 1:23 PM HADT (22:23 UTC), 22 km (14 mi) below the surface.
A larger quake followed: M3.8 189 km ESE of Atka, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.7 (ml), micro
- Local time
- UTC
- 2021-04-17 22:23:49 UTC
- Depth
- 22.1 km (13.7 mi), shallow
- Epicenter
- 51.361° N, 170.839° 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 3.6 km horizontally, 11.4 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 233°, poorly surrounded by stations
- Stations used
- 22
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 5 in the 30 days before it.
After
- 2.8190 km E of Atka, Alaska · 1988 days ago · 35 km deep · 87 km away
- 3.8189 km ESE of Atka, Alaska · 1962 days ago · 38 km deep · 71 km away
- 3.4203 km SSW of Nikolski, Alaska · 1954 days ago · 10 km deep · 26 km away
- 3.8154 km SW of Nikolski, Alaska · 1952 days ago · 35 km deep · 73 km away
- 3.4258 km SSW of Nikolski, Alaska · 1948 days ago · 16 km deep · 52 km away
Before
- 2.7178 km WSW of Nikolski, Alaska · 1988 days ago · 35 km deep · 90 km away
- 2.5136 km SW of Nikolski, Alaska · 1988 days ago · 35 km deep · 89 km away
- 3.4134 km SW of Nikolski, Alaska · 1995 days ago · 22 km deep · 93 km away
- 3.4219 km SSW of Nikolski, Alaska · 2009 days ago · 10 km deep · 50 km away
- 3.6164 km SW of Nikolski, Alaska · 2010 days ago · 37 km deep · 68 km away
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000e2nj (also filed as ak0214xbqp9b). Read Sat, Sep 26, 2026, 3:35 PM UTC.