Alaska earthquakes

M4.8 earthquake 135 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 135 km WSW of Adak, Alaska on Tue, Oct 6, 2020, 4:34 PM HADT (01:34 UTC), 47 km (29 mi) below the surface.

A larger quake followed: M4.9 182 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: 4.8 (mb), light
Local time: Tue, Oct 6, 2020, 4:34 PM HADT
UTC: 2020-10-07 01:34:15 UTC
Depth: 46.8 km (29.1 mi), shallow
Epicenter: 51.302° N, 178.368° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.2 km horizontally, 5.2 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 121°
Stations used: 178

Nearby

Within 100 km, magnitude 1.8 and up: 107 in the 60 days after this one and 45 in the 30 days before it.

After

The first 60 of 107.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c69l (also filed as ak020cwqt9y1). Read Sun, Sep 27, 2026, 11:42 AM UTC.