M2.8 earthquake 239 km SSW of Adak, Alaska
A magnitude 2.8 earthquake struck 239 km SSW of Adak, Alaska on Fri, Sep 3, 2021, 12:16 AM HADT (09:16 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M3.9 177 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
- 2021-09-03 09:16:06 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.050° N, 178.450° 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 7.7 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.13
- Depth from
- Operator assigned
- Station coverage gap
- 280°, poorly surrounded by stations
- Stations used
- 29
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.4204 km SSW of Adak, Alaska · 1836 days ago · 10 km deep · 39 km away
- 3.9177 km SSW of Adak, Alaska · 1824 days ago · 10 km deep · 62 km away
- 2.3179 km SSW of Adak, Alaska · 1822 days ago · 25 km deep · 60 km away
- 3.2157 km SW of Adak, Alaska · 1807 days ago · 33 km deep · 86 km away
- 3.5237 km SSW of Adak, Alaska · 1794 days ago · 10 km deep · 13 km away
- 2.3178 km S of Adak, Alaska · 1790 days ago · 20 km deep · 98 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000ff1p (also filed as ak021baznq0m). Read Fri, Sep 25, 2026, 7:05 PM UTC.