M2.4 earthquake 18 km S of Susitna North, Alaska

A magnitude 2.4 earthquake struck 18 km S of Susitna North, Alaska on Sat, Sep 11, 2021, 1:54 AM AKDT (09:54 UTC), 33 km (21 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M3.9 35 km NE of Chase, 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
2.4	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.034 · 116 stations

No one has reported feeling this quake to the USGS.

An automatic solution; a seismologist may revise it.

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

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and 112 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak021bo86oed (also filed as us7000faa0). Read Sat, Oct 3, 2026, 6:14 AM UTC.