M2.8 earthquake 188 km S of Adak, Alaska
A magnitude 2.8 earthquake struck 188 km S of Adak, Alaska on Wed, Oct 27, 2021, 1:42 AM HADT (10:42 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M3.1 178 km SSW of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.8 (ml), micro
- Local time
- UTC
- 2021-10-27 10:42:04 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.209° N, 176.140° 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 8.1 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.15
- Depth from
- Operator assigned
- Station coverage gap
- 280°, poorly surrounded by stations
- Stations used
- 21
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 1.9156 km SSE of Adak, Alaska · 1789 days ago · 36 km deep · 72 km away
- 2.3178 km S of Adak, Alaska · 1788 days ago · 20 km deep · 72 km away
- 3.1178 km SSW of Adak, Alaska · 1741 days ago · 10 km deep · 93 km away
- 2.7186 km SSE of Adak, Alaska · 1737 days ago · 10 km deep · 78 km away
- 2.2171 km S of Adak, Alaska · 1736 days ago · 10 km deep · 18 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000g9pm (also filed as ak021dsbfgu6). Read Thu, Sep 24, 2026, 9:18 AM UTC.