Alaska earthquakes

M5.1 earthquake 185 km WSW of Adak, Alaska

A magnitude 5.1 earthquake struck 185 km WSW of Adak, Alaska on Thu, Jun 18, 2020, 5:59 PM HADT (02:59 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.2 186 km WSW of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 5.1 (mww), moderate
Local time: Thu, Jun 18, 2020, 5:59 PM HADT
UTC: 2020-06-19 02:59:28 UTC
Depth: 33.1 km (20.6 mi), shallow
Epicenter: 51.175° N, 179.056° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

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: 5.1 Mww
Nodal plane 1: Strike 262°, dip 33°, rake 107°
Nodal plane 2: Strike 63°, dip 59°, rake 79°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.4 km horizontally, 3.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 135°
Stations used: 121

Nearby

Within 100 km, magnitude 2.1 and up: 55 in the 60 days after this one and 33 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 us6000ael8 (also filed as ak0207uufx02, iscgem618551266). Read Wed, Sep 30, 2026, 12:14 AM UTC.