M2.5 earthquake 239 km S of Atka, Alaska
A magnitude 2.5 earthquake struck 239 km S of Atka, Alaska on Wed, Aug 20, 2025, 1:37 AM HADT (10:37 UTC), 15 km (9 mi) below the surface.
A larger quake followed: M3.1 202 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
- 2.5 (ML, local (Richter)), micro
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2025-08-20 10:37:06 UTC
- Depth
- 15.2 km (9.4 mi), shallow
- Epicenter
- 50.066° N, 174.672° 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 |
|---|---|---|---|
| 2.5 | ML, local (Richter) | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.115 · 10 stations |
| 2.3 | 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 7.1 km horizontally, 9.5 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 283°, poorly surrounded by stations
- Stations used
- 14
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 5 in the 30 days before it.
After
- 2.6228 km SSE of Adak, Alaska · 409 days ago · 20 km deep · 16 km away
- 3.1202 km SSE of Atka, Alaska · 398 days ago · 10 km deep · 88 km away
- 2.8213 km SSE of Adak, Alaska · 397 days ago · 10 km deep · 33 km away
- 2.5167 km S of Atka, Alaska · 396 days ago · 10 km deep · 77 km away
- 3.1250 km SSE of Adak, Alaska · 350 days ago · 10 km deep · 81 km away
Before
- 2.9191 km SSE of Adak, Alaska · 410 days ago · 36 km deep · 57 km away
- 2.5174 km S of Atka, Alaska · 413 days ago · 25 km deep · 73 km away
- 2.9161 km SSW of Atka, Alaska · 429 days ago · 10 km deep · 87 km away
- 1.8152 km SE of Adak, Alaska · 431 days ago · 26 km deep · 92 km away
- 1.8185 km SSE of Adak, Alaska · 432 days ago · 8 km deep · 59 km away
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000ritt (also filed as ak025anuusx5). Read Sat, Oct 3, 2026, 2:34 PM UTC.