Alaska earthquakes

M2.5 earthquake 88 km NE of Adak, Alaska

A magnitude 2.5 earthquake struck 88 km NE of Adak, Alaska on Sun, Oct 11, 2020, 2:00 PM HADT (23:00 UTC), 167 km (104 mi) below the surface.

A larger quake followed: M3.9 63 km ESE 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: 2.5 (ml), micro
Local time: Sun, Oct 11, 2020, 2:00 PM HADT
UTC: 2020-10-11 23:00:37 UTC
Depth: 166.6 km (103.5 mi), intermediate-depth
Epicenter: 52.355° N, 175.614° 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.8 km horizontally, 9.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 195°, poorly surrounded by stations
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: 60 in the 60 days after this one and 53 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 us6000c9pp (also filed as ak020d3puz0t). Read Mon, Sep 28, 2026, 8:43 AM UTC.