M3.3 earthquake 39 km E of Pedro Bay, Alaska

A magnitude 3.3 earthquake struck 39 km E of Pedro Bay, Alaska on Thu, Oct 1, 2020, 5:35 PM AKDT (01:35 UTC), 129 km (80 mi) below the surface.

A larger quake followed: M3.5 67 km SE of Pope-Vannoy Landing, 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
3.3	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.4	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 200 in the 60 days after this one and 135 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak020coh4raq (also filed as us6000c4in). Read Thu, Oct 1, 2026, 2:40 PM UTC.