Alaska earthquakes

M4.9 earthquake 209 km WSW of Adak, Alaska

A magnitude 4.9 earthquake struck 209 km WSW of Adak, Alaska on Sun, Nov 24, 2019, 3:26 AM HAST (13:26 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M6.0 127 km SW of Adak, Alaska. This one was a foreshock.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 4.9 (Mww, W-phase moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Nov 24, 2019, 3:26 AM HAST
UTC: 2019-11-24 13:26:20 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.883° N, 179.195° 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
4.9	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.062 · 25 stations
5.13	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.0	Mww, W-phase moment	Alaska Earthquake Center	Preliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 4.9 Mww
Nodal plane 1: Strike 65°, dip 45°, rake 77°
Nodal plane 2: Strike 263°, dip 46°, rake 103°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.6 km horizontally, 1.7 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 121°
Stations used: 149

Nearby

Within 100 km, magnitude 1.9 and up: 105 in the 60 days after this one and 41 in the 30 days before it.

After

The first 60 of 105.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70006cg7 (also filed as ak019f2o637b, iscgem616918584). Read Thu, Oct 1, 2026, 1:11 PM UTC.