Alaska earthquakes

M5.2 earthquake 186 km WSW of Adak, Alaska

A magnitude 5.2 earthquake struck 186 km WSW of Adak, Alaska on Thu, Jun 18, 2020, 6:08 PM HADT (03:08 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude: 5.2 (mww), moderate
Local time: Thu, Jun 18, 2020, 6:08 PM HADT
UTC: 2020-06-19 03:08:32 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.169° N, 179.069° W
Region: Alaska
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

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: Oblique reverse
Moment magnitude: 5.2 Mww
Nodal plane 1: Strike 272°, dip 30°, rake 125°
Nodal plane 2: Strike 52°, dip 66°, rake 72°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.1 km horizontally, 0.3 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 51°
Stations used: 154

Nearby

Within 100 km, magnitude 2.2 and up: 47 in the 60 days after this one and 27 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 us6000aeln (also filed as at00qc5kq6, ak0207uuqfi1, iscgem618551270). Read Tue, Sep 29, 2026, 7:22 PM UTC.