Alaska earthquakes

M4.0 earthquake 119 km E of Chignik, Alaska

A magnitude 4.0 earthquake struck 119 km E of Chignik, Alaska on Tue, Sep 15, 2026, 6:32 AM AKDT (14:32 UTC), 18 km (11 mi) below the surface.

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: 4.0 (ML, local (Richter)), light
Magnitude from: Alaska Earthquake Center
Local time: Tue, Sep 15, 2026, 6:32 AM AKDT
UTC: 2026-09-15 14:32:38 UTC
Depth: 17.9 km (11.1 mi), shallow
Epicenter: 56.199° N, 156.488° W
Region: Alaska
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Reviewed · ±0.3 · 95 stations
4.1	Mwr, regional moment	USGS National Earthquake Information Center	Preliminary · ±0.086 · 13 stations

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: 0.9% of gravity
Peak ground velocity: 0.3 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. If you felt it, tell the USGS: every report sharpens the shaking map.

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: 4.1 Mwr
Nodal plane 1: Strike 322°, dip 41°, rake -174°
Nodal plane 2: Strike 227°, dip 86°, rake -49°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.1 km horizontally, 3.3 km in depth
Magnitude uncertainty: ±0.30
Station coverage gap: 170°
Stations used: 188

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast269 kmENE

Nearby

Within 100 km, magnitude 1.5 and up: 19 since this one and 44 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 aka2026shusro (also filed as us7000thlv). Read Thu, Oct 1, 2026, 4:13 PM UTC.