M3.3 earthquake 60 km NNW of Atka, Alaska

A magnitude 3.3 earthquake struck 60 km NNW of Atka, Alaska on Wed, Jul 5, 2023, 6:56 AM HADT (15:56 UTC), 163 km (101 mi) below the surface.

A larger quake followed: M4.1 86 km NE of Adak, 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)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.081 · 20 stations
3.2	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 98 in the 60 days after this one and 15 in the 30 days before it.

The first 60 of 98.

From the USGS Earthquake Hazards Program and its partner networks, event us7000kfct (also filed as ak0238jv85u2). Read Thu, Oct 1, 2026, 7:36 AM UTC.