Alaska earthquakes

M3.8 earthquake 92 km SSE of Igiugig, Alaska

A magnitude 3.8 earthquake struck 92 km SSE of Igiugig, Alaska on Mon, Oct 4, 2021, 8:26 PM AKDT (04:26 UTC), 129 km (80 mi) below the surface.

A larger quake followed: M4.3 62 km SE of King Salmon, Alaska. This one was a foreshock.

Naknek forecast More in Alaska

Map

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

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The earthquake

Magnitude: 3.8 (ml), minor
Local time: Mon, Oct 4, 2021, 8:26 PM AKDT
UTC: 2021-10-05 04:26:31 UTC
Depth: 129.1 km (80.2 mi), intermediate-depth
Epicenter: 58.623° N, 155.051° 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: 0.1% of gravity
Peak ground velocity: -4.3 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.

Stations used: 254

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 78 in the 60 days after this one and 30 in the 30 days before it.

After

The first 60 of 78.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021crtxuqx (also filed as us6000frt4). Read Wed, Sep 30, 2026, 1:33 AM UTC.