M3.6 earthquake 77 km ESE of Akutan, Alaska

A magnitude 3.6 earthquake struck 77 km ESE of Akutan, Alaska on Mon, Sep 21, 2020, 9:15 PM AKDT (05:15 UTC), 42 km (26 mi) below the surface.

A larger quake followed: M4.5 47 km NE of Akutan, 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
3.6	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.109 · 21 stations
3.4	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: 106 in the 60 days after this one and 43 in the 30 days before it.

The first 60 of 106.

From the USGS Earthquake Hazards Program and its partner networks, event us6000bzr8 (also filed as ak020c800srh). Read Sat, Oct 3, 2026, 7:56 PM UTC.