Alaska earthquakes

M3.9 earthquake 35 km NE of Chase, Alaska

A magnitude 3.9 earthquake struck 35 km NE of Chase, Alaska on Tue, Oct 19, 2021, 12:06 AM AKDT (08:06 UTC), 74 km (46 mi) below the surface.

A larger quake followed: M4.4 60 km SSE of Cantwell, Alaska. This one was a foreshock.

Talkeetna 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: 3.9 (ml), minor
Local time: Tue, Oct 19, 2021, 12:06 AM AKDT
UTC: 2021-10-19 08:06:27 UTC
Depth: 74.4 km (46.2 mi), intermediate-depth
Epicenter: 62.660° N, 149.586° W
Region: Alaska
Felt reports: 33
Strongest shaking: III, weak shaking
PAGER alert: Green
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: III, weak shaking
Peak ground acceleration: 0.3% of gravity
Peak ground velocity: -2.2 cm/s
Map: Automatic

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

Did you feel it?

33 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	69%
1 to 10	29%
10 to 100	2%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

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: at least 199 in the 60 days after this one and 149 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021df1q5j1 (also filed as us6000fvu5). Read Thu, Sep 24, 2026, 12:10 PM UTC.