Alaska earthquakes

M3.9 earthquake 84 km ESE of Chignik, Alaska

A magnitude 3.9 earthquake struck 84 km ESE of Chignik, Alaska on Sat, Aug 8, 2026, 5:57 PM AKDT (01:57 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M4.0 119 km E of Chignik, 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: 3.9 (ml), minor
Local time: Sat, Aug 8, 2026, 5:57 PM AKDT
UTC: 2026-08-09 01:57:04 UTC
Depth: 12.7 km (7.9 mi), shallow
Epicenter: 56.018° N, 157.142° W
Region: Alaska
Strongest shaking: III, 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: III, weak shaking
Peak ground acceleration: 0.5% of gravity
Peak ground velocity: 0.1 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 3.9 Mwr
Nodal plane 1: Strike 130°, dip 9°, rake -21°
Nodal plane 2: Strike 242°, dip 87°, rake -98°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 2.5 km horizontally, 2.2 km in depth
Magnitude uncertainty: ±0.10
Station coverage gap: 148°
Stations used: 177

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast224 kmENE

Nearby

Within 100 km, magnitude 1.5 and up: 42 since this one and 18 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 aka2026pqmsof (also filed as us6000tjc8). Read Wed, Sep 23, 2026, 5:13 AM UTC.