M2.3 earthquake 22 km SSW of Susitna North, Alaska

A magnitude 2.3 earthquake struck 22 km SSW of Susitna North, Alaska on Sat, Jul 31, 2021, 2:07 AM AKDT (10:07 UTC), 39 km (24 mi) below the surface.

A larger quake followed: M4.3 30 km WNW of Willow, 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
2.3	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.03 · 146 stations

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: at least 199 in the 60 days after this one and 123 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event ak0219qrxblv (also filed as us6000f0yc). Read Fri, Oct 2, 2026, 7:02 PM UTC.