M3.5 earthquake 99 km SE of Akutan, Alaska

A magnitude 3.5 earthquake struck 99 km SE of Akutan, Alaska on Wed, Aug 19, 2020, 12:02 PM AKDT (20:02 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.5 151 km S of False Pass, 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
3.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.091 · 16 stations
3.1	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: 86 in the 60 days after this one and 86 in the 30 days before it.

The first 60 of 86.

From the USGS Earthquake Hazards Program and its partner networks, event us6000bheq (also filed as ak020ao0lopy). Read Thu, Oct 1, 2026, 4:12 PM UTC.