M2.8 earthquake 275 km SSE of Atka, Alaska
A magnitude 2.8 earthquake struck 275 km SSE of Atka, Alaska on Tue, Sep 2, 2025, 11:20 AM HADT (20:20 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M3.8 176 km SSE 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
- 2.8 (ML, local (Richter)), micro
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2025-09-02 20:20:22 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.065° N, 172.209° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 2.8 | ML, local (Richter) | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.115 · 10 stations |
| 3.0 | ML, local (Richter) | Alaska Earthquake Center | Preliminary |
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 10.2 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 242°, poorly surrounded by stations
- Stations used
- 13
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 4 in the 30 days before it.
After
- 3.1205 km SSE of Atka, Alaska · 370 days ago · 10 km deep · 78 km away
- 3.8176 km SSE of Atka, Alaska · 349 days ago · 10 km deep · 99 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000rmde (also filed as ak025b9ip1a0). Read Fri, Oct 2, 2026, 11:32 AM UTC.