M3.1 earthquake 69 km SE of Sand Point, Alaska

A magnitude 3.1 earthquake struck 69 km SE of Sand Point, Alaska on Mon, Sep 28, 2020, 11:55 AM AKDT (19:55 UTC), 28 km (18 mi) below the surface.

A larger quake followed: M7.6 2020 Sand Point, Alaska Earthquake. 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
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
2.9	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: 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 us6000c6xz (also filed as ak020ci5tfqt). Read Thu, Oct 1, 2026, 4:25 AM UTC.