M3.4 earthquake 60 km ESE of Pedro Bay, Alaska

A magnitude 3.4 earthquake struck 60 km ESE of Pedro Bay, Alaska on Tue, Apr 13, 2021, 9:56 PM AKDT (05:56 UTC), 100 km (62 mi) below the surface.

A larger quake followed: M3.7 50 km WNW of Nanwalek, 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
3.4	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.031 · 138 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 at least 200 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak0214s37cgd (also filed as us6000e1es). Read Thu, Oct 1, 2026, 6:34 AM UTC.