Alaska earthquakes

M4.3 earthquake Alaska Peninsula

A magnitude 4.3 earthquake struck in the Alaska Peninsula on Wed, Oct 12, 2022, 1:15 AM AKDT (09:15 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M4.4 119 km SE 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: 4.3 (mb, body-wave), light
Magnitude from: Alaska Earthquake Center
Local time: Wed, Oct 12, 2022, 1:15 AM AKDT
UTC: 2022-10-12 09:15:48 UTC
Depth: 11.5 km (7.1 mi), shallow
Epicenter: 55.465° N, 157.126° W
Region: Alaska
Strongest shaking: I, not felt 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
4.3	mb, body-wave	Alaska Earthquake Center	Preferred · Preliminary
4.3	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.169 · 10 stations

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -4.5 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: 73

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast214 kmE

Nearby

Within 100 km, magnitude 1.5 and up: 53 in the 60 days after this one and 35 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 ak022d3hm4tb (also filed as us6000isyl). Read Thu, Oct 1, 2026, 11:54 PM UTC.