Alaska earthquakes

M3.9 earthquake 186 km E of Atka, Alaska

A magnitude 3.9 earthquake struck 186 km E of Atka, Alaska on Sun, Nov 9, 2025, 2:05 AM HAST (12:05 UTC), 52 km (32 mi) below the surface.

A larger quake followed: M4.4 121 km E of Atka, Alaska. This one was a foreshock.

More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
3.9 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-11-09 12:05:38 UTC
Depth
52.1 km (32.3 mi), shallow
Epicenter
52.175° N, 171.480° W
Region
Alaska
Strongest shaking
II, weak shaking
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.ScaleComputed byNotes
3.9mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.063 · 67 stations
4.0ML, local (Richter)Alaska Earthquake CenterPreliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
II, weak shaking
Peak ground acceleration
0.3% of gravity
Peak ground velocity
0.1 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

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 7.3 km horizontally, 9.2 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
171°
Stations used
71

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 4.3185 km E of Atka, Alaska · 328 days ago · 50 km deep · 20 km away
  2. 3.5194 km E of Atka, Alaska · 328 days ago · 42 km deep · 22 km away
  3. 3.6182 km WSW of Nikolski, Alaska · 313 days ago · 35 km deep · 23 km away
  4. 2.6140 km SW of Nikolski, Alaska · 311 days ago · 35 km deep · 65 km away
  5. 2.7161 km SW of Nikolski, Alaska · 311 days ago · 10 km deep · 75 km away
  6. 3.3193 km WSW of Nikolski, Alaska · 311 days ago · 10 km deep · 16 km away
  7. 4.4121 km E of Atka, Alaska · 307 days ago · 73 km deep · 66 km away
  8. 3.7166 km ESE of Atka, Alaska · 304 days ago · 49 km deep · 46 km away
  9. 2.9152 km SW of Nikolski, Alaska · 298 days ago · 35 km deep · 51 km away
  10. 3.0192 km WSW of Nikolski, Alaska · 288 days ago · 10 km deep · 9 km away
  11. 3.1187 km E of Atka, Alaska · 283 days ago · 8 km deep · 5 km away
  12. 3.5131 km E of Atka, Alaska · 281 days ago · 56 km deep · 57 km away
  13. 3.3156 km SW of Nikolski, Alaska · 274 days ago · 10 km deep · 78 km away
  14. 3.4109 km E of Atka, Alaska · 274 days ago · 122 km deep · 77 km away
  15. 3.7228 km SW of Nikolski, Alaska · 273 days ago · 10 km deep · 95 km away

Before

  1. 3.6196 km WSW of Nikolski, Alaska · 328 days ago · 35 km deep · 19 km away
  2. 4.7189 km WSW of Nikolski, Alaska · 328 days ago · 54 km deep · 8 km away · tsunami flag
  3. 3.8194 km WSW of Nikolski, Alaska · 330 days ago · 34 km deep · 16 km away
  4. 3.8158 km SW of Nikolski, Alaska · 341 days ago · 41 km deep · 53 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rmhy (also filed as ak025edudzb3). Read Sat, Oct 3, 2026, 3:07 PM UTC.