Alaska earthquakes

M2.9 earthquake 109 km SW of Atka, Alaska

A magnitude 2.9 earthquake struck 109 km SW of Atka, Alaska on Mon, Mar 23, 2020, 8:58 PM HADT (05:58 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M4.8 117 km SSW of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.9 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Mar 23, 2020, 8:58 PM HADT
UTC: 2020-03-24 05:58:54 UTC
Depth: 14.3 km (8.9 mi), shallow
Epicenter: 51.405° N, 175.150° 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
2.6	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 4.1 km horizontally, 12.8 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 239°, poorly surrounded by stations
Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 148 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 148.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008ydu (also filed as ak0203v0gv8q). Read Sat, Oct 3, 2026, 10:32 AM UTC.