M2.9 earthquake 203 km SE of Chiniak, Alaska

A magnitude 2.9 earthquake struck 203 km SE of Chiniak, Alaska on Mon, Oct 23, 2023, 8:07 PM AKDT (04:07 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.7 Gulf of 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
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.077 · 22 stations
2.6	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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: 31 in the 60 days after this one and 8 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us7000la5z (also filed as ak023dn91eus). Read Thu, Oct 1, 2026, 4:57 AM UTC.