M4.5 earthquake 72 km SSW of Nikolski, Alaska

A magnitude 4.5 earthquake struck 72 km SSW of Nikolski, Alaska on Fri, Oct 6, 2023, 3:34 AM AKDT (11:34 UTC), 34 km (21 mi) below the surface.

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
4.5	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.062 · 76 stations
4.4	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.

3 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 58 in the 60 days after this one and 38 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000ldf6 (also filed as ak023ctlow6o). Read Fri, Oct 2, 2026, 9:44 PM UTC.