Alaska earthquakes

M4.2 earthquake 259 km W of Adak, Alaska

A magnitude 4.2 earthquake struck 259 km W of Adak, Alaska on Tue, Aug 6, 2019, 2:27 PM GMT+12 (02:27 UTC), 61 km (38 mi) below the surface.

A larger quake followed: M4.8 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 4.2 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Aug 6, 2019, 2:27 PM GMT+12
UTC: 2019-08-06 02:27:22 UTC
Depth: 60.9 km (37.9 mi), shallow
Epicenter: 51.505° N, 179.657° E
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
4.2	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.049 · 117 stations
4.0	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 6.6 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 154°
Stations used: 100

Nearby

Within 100 km, magnitude 1.5 and up: 100 in the 60 days after this one and 54 in the 30 days before it.

After

The first 60 of 100.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000514j (also filed as ak019a0kic0h). Read Thu, Oct 1, 2026, 10:17 PM UTC.