M3.8 earthquake 176 km SSE of Atka, Alaska
A magnitude 3.8 earthquake struck 176 km SSE of Atka, Alaska on Sat, Oct 18, 2025, 5:08 AM HADT (14:08 UTC), 10 km (6 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
- 3.8 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2025-10-18 14:08:23 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.818° N, 172.947° 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. | Scale | Computed by | Notes |
|---|---|---|---|
| 3.8 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.136 · 14 stations |
| 3.6 | ML, local (Richter) | Alaska Earthquake Center | Preliminary |
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
- 0.1% of gravity
- Peak ground velocity
- 0.0 cm/s
- Map
- Automatic
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 3.4 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.14
- Depth from
- Operator assigned
- Station coverage gap
- 221°, poorly surrounded by stations
- Stations used
- 28
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.7195 km SE of Atka, Alaska · 319 days ago · 10 km deep · 45 km away
- 3.8175 km SSE of Atka, Alaska · 314 days ago · 10 km deep · 18 km away
- 5.179 km SE of Atka, Alaska · 304 days ago · 35 km deep · 99 km away · felt by 2
- 2.3149 km S of Atka, Alaska · 296 days ago · 10 km deep · 80 km away
- 3.3140 km SE of Atka, Alaska · 293 days ago · 10 km deep · 56 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000ri2i (also filed as ak025ddhrv76). Read Fri, Oct 2, 2026, 8:11 AM UTC.