Alaska earthquakes

M2.5 earthquake 19 km SW of Atka, Alaska

A magnitude 2.5 earthquake struck 19 km SW of Atka, Alaska on Mon, Jul 12, 2021, 1:04 PM HADT (22:04 UTC), 186 km (116 mi) below the surface.

A larger quake followed: M2.7 66 km ENE of Atka, 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: Mon, Jul 12, 2021, 1:04 PM HADT
UTC: 2021-07-12 22:04:42 UTC
Depth: 186.4 km (115.8 mi), intermediate-depth
Epicenter: 52.066° N, 174.390° W
Region: Alaska
Strongest shaking: II, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: II, weak shaking
Peak ground acceleration: 0.2% of gravity
Peak ground velocity: -3.9 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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 14.0 km horizontally, 3.4 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 193°, poorly surrounded by stations
Stations used: 25

Nearby

Within 100 km, magnitude 1.5 and up: 159 in the 60 days after this one and 35 in the 30 days before it.

After

The first 60 of 159.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000elbx (also filed as ak0218vjuh4l). Read Thu, Sep 24, 2026, 9:22 AM UTC.