Alaska earthquakes

M4.3 earthquake 68 km SSE of Adak, Alaska

A magnitude 4.3 earthquake struck 68 km SSE of Adak, Alaska on Fri, Oct 9, 2020, 10:24 AM HADT (19:24 UTC), 28 km (18 mi) below the surface.

Map

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

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The earthquake

Magnitude: 4.3 (mwr), light
Local time: Fri, Oct 9, 2020, 10:24 AM HADT
UTC: 2020-10-09 19:24:17 UTC
Depth: 28.3 km (17.6 mi), shallow
Epicenter: 51.361° N, 176.094° 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: 4.3 Mwr
Nodal plane 1: Strike 255°, dip 18°, rake 66°
Nodal plane 2: Strike 100°, dip 74°, rake 97°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.8 km horizontally, 5.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 184°, poorly surrounded by stations
Stations used: 104

Nearby

Within 100 km, magnitude 1.5 and up: 118 in the 60 days after this one and 84 in the 30 days before it.

After

The first 60 of 118.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c758 (also filed as ak020d0cjmjb). Read Sun, Sep 27, 2026, 11:07 PM UTC.