M2.5 earthquake 209 km SSE of Adak, Alaska
A magnitude 2.5 earthquake struck 209 km SSE of Adak, Alaska on Mon, Sep 30, 2019, 12:55 AM HADT (09:55 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M2.6 south of the Aleutian Islands. 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
- 2019-09-30 09:55:27 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.288° N, 175.019° 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 |
| 2.5 | 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 8.4 km horizontally, 2.0 km in depth
- Depth from
- Operator assigned
- Station coverage gap
- 236°, poorly surrounded by stations
- Stations used
- 20
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 2.6south of the Aleutian Islands · 2553 days ago · 15 km deep · 95 km away
- 1.9196 km S of Atka, Alaska · 2553 days ago · 20 km deep · 76 km away
- 2.3176 km SE of Adak, Alaska · 2539 days ago · 33 km deep · 35 km away
- 2.6141 km SSE of Adak, Alaska · 2527 days ago · 30 km deep · 76 km away
- 2.2175 km SSE of Adak, Alaska · 2521 days ago · 8 km deep · 73 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us70005xil (also filed as ak019cjnei48). Read Thu, Oct 1, 2026, 7:33 PM UTC.