Alaska earthquakes

M4.3 earthquake 131 km SSE of Perryville, Alaska

A magnitude 4.3 earthquake struck 131 km SSE of Perryville, Alaska on Sun, Sep 19, 2021, 5:17 AM AKDT (13:17 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M5.6 115 km SSE of Perryville, Alaska. This one was a foreshock.

Sand Point 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: 4.3 (mb), light
Local time: Sun, Sep 19, 2021, 5:17 AM AKDT
UTC: 2021-09-19 13:17:45 UTC
Depth: 17.4 km (10.8 mi), shallow
Epicenter: 54.771° N, 158.589° 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: -3.3 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.

Location uncertainty: About 3.8 km horizontally, 5.3 km in depth
Magnitude uncertainty: ±0.20
Depth from: From location
Station coverage gap: 169°
Stations used: 60

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast137 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 194 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 194.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fcnm (also filed as ak021c1inazs). Read Sat, Sep 26, 2026, 5:25 PM UTC.