Alaska earthquakes

M3.3 earthquake 290 km WSW of Adak, Alaska

A magnitude 3.3 earthquake struck 290 km WSW of Adak, Alaska on Tue, May 18, 2021, 12:58 PM GMT+12 (00:58 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M5.0 286 km WSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Tue, May 18, 2021, 12:58 PM GMT+12
UTC: 2021-05-18 00:58:31 UTC
Depth: 20.4 km (12.7 mi), shallow
Epicenter: 50.863° N, 179.522° E
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

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, 8.5 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 236°, poorly surrounded by stations
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 32 in the 60 days after this one and 7 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 us7000e45z (also filed as ak0216c8ifbh). Read Sat, Sep 26, 2026, 6:21 AM UTC.