Alaska earthquakes

M5.0 earthquake 141 km WSW of Adak, Alaska

A magnitude 5.0 earthquake struck 141 km WSW of Adak, Alaska on Sat, Jun 13, 2020, 2:43 AM HADT (11:43 UTC), 45 km (28 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: 5.0 (mww), moderate
Local time: Sat, Jun 13, 2020, 2:43 AM HADT
UTC: 2020-06-13 11:43:34 UTC
Depth: 44.7 km (27.8 mi), shallow
Epicenter: 51.237° N, 178.393° 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: 5.0 Mww
Nodal plane 1: Strike 268°, dip 34°, rake 119°
Nodal plane 2: Strike 54°, dip 61°, rake 72°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.3 km horizontally, 3.5 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 132°
Stations used: 112

Nearby

Within 100 km, magnitude 2.0 and up: 63 in the 60 days after this one and 33 in the 30 days before it.

After

The first 60 of 63.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ab9k (also filed as ak0207l2hban, iscgem618541755). Read Tue, Sep 29, 2026, 9:49 PM UTC.