Alaska earthquakes

M4.8 earthquake 193 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 193 km WSW of Adak, Alaska on Fri, Jun 21, 2024, 3:12 AM HADT (12:12 UTC), 35 km (22 mi) below the surface.

Map

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

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The earthquake

Magnitude: 4.8 (Mww, W-phase moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Jun 21, 2024, 3:12 AM HADT
UTC: 2024-06-21 12:12:40 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.067° N, 179.100° W
Region: Alaska
Strongest shaking: V, moderate shaking
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
4.8	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.073 · 18 stations
4.8	Mww, W-phase moment	Alaska Earthquake Center	Preliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 7.3% of gravity
Peak ground velocity: 3.5 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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: 4.8 Mww
Nodal plane 1: Strike 271°, dip 27°, rake 112°
Nodal plane 2: Strike 66°, dip 66°, rake 79°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.8 km horizontally, 1.7 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 81°
Stations used: 99

Nearby

Within 100 km, magnitude 1.8 and up: 154 in the 60 days after this one and 119 in the 30 days before it.

After

The first 60 of 154.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000mtsd (also filed as ak0247yb6wbo). Read Thu, Oct 1, 2026, 11:22 AM UTC.