M3.5 earthquake 121 km SE of Atka, Alaska
A magnitude 3.5 earthquake struck 121 km SE of Atka, Alaska on Mon, Oct 6, 2025, 6:54 AM HADT (15:54 UTC), 17 km (10 mi) below the surface.
A larger quake followed: M5.1 79 km SE 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
- 3.5 (ML, local (Richter)), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2025-10-06 15:54:52 UTC
- Depth
- 16.6 km (10.3 mi), shallow
- Epicenter
- 51.509° N, 172.826° 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 |
|---|---|---|---|
| 3.5 | ML, local (Richter) | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.091 · 16 stations |
| 3.1 | 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 8.5 km horizontally, 6.2 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 219°, poorly surrounded by stations
- Stations used
- 17
Nearby
Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.
After
- 3.8176 km SSE of Atka, Alaska · 350 days ago · 10 km deep · 77 km away
- 3.167 km E of Atka, Alaska · 324 days ago · 91 km deep · 84 km away
- 3.7195 km SE of Atka, Alaska · 320 days ago · 10 km deep · 78 km away
- 3.8175 km SSE of Atka, Alaska · 315 days ago · 10 km deep · 88 km away
- 3.487 km ESE of Atka, Alaska · 313 days ago · 10 km deep · 50 km away
- 2.853 km S of Atka, Alaska · 312 days ago · 8 km deep · 98 km away
- 2.862 km S of Atka, Alaska · 312 days ago · 10 km deep · 87 km away
- 2.480 km S of Atka, Alaska · 310 days ago · 11 km deep · 92 km away
- 4.4121 km E of Atka, Alaska · 307 days ago · 73 km deep · 71 km away
- 5.179 km SE of Atka, Alaska · 305 days ago · 35 km deep · 46 km away · felt by 2
- 3.7166 km ESE of Atka, Alaska · 304 days ago · 49 km deep · 76 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000rf5h (also filed as ak025cto74k6). Read Sat, Oct 3, 2026, 5:43 AM UTC.