Alaska earthquakes

M5.0 earthquake 286 km WSW of Adak, Alaska

A magnitude 5.0 earthquake struck 286 km WSW of Adak, Alaska on Tue, May 18, 2021, 5:39 PM GMT+12 (05:39 UTC), 43 km (27 mi) below the surface.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 5.0 (mb), moderate
Local time: Tue, May 18, 2021, 5:39 PM GMT+12
UTC: 2021-05-18 05:39:59 UTC
Depth: 43.3 km (26.9 mi), shallow
Epicenter: 51.189° N, 179.388° E
Region: Alaska
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: III, weak shaking
Peak ground acceleration: 1.0% of gravity
Peak ground velocity: -0.5 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.4 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.02
Depth from: From location
Station coverage gap: 104°
Stations used: 158

Nearby

Within 100 km, magnitude 2.0 and up: 22 in the 60 days after this one and 12 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000e407 (also filed as ak0216cbdn6v). Read Fri, Sep 25, 2026, 6:10 PM UTC.