M4.3 earthquake 34 km NNE of Dutch Harbor, Alaska

A magnitude 4.3 earthquake struck 34 km NNE of Dutch Harbor, Alaska on Sun, Jul 31, 2022, 5:59 PM AKDT (01:59 UTC), 110 km (68 mi) below the surface.

A larger quake followed: M4.6 69 km SE of Unalaska, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.063 · 71 stations
4.3	mb, body-wave	Alaska Earthquake Center	Preliminary

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 65 in the 60 days after this one and 38 in the 30 days before it.

The first 60 of 65.

From the USGS Earthquake Hazards Program and its partner networks, event us6000i72x (also filed as ak0229saf2jd). Read Mon, Oct 5, 2026, 4:02 AM UTC.