M3.0 earthquake 32 km N of Adak, Alaska

A magnitude 3.0 earthquake struck 32 km N of Adak, Alaska on Thu, Mar 16, 2023, 10:16 PM HADT (07:16 UTC), 238 km (148 mi) below the surface.

A larger quake followed: M4.7 81 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
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.091 · 16 stations
2.9	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: 152 in the 60 days after this one and 168 in the 30 days before it.

The first 60 of 152.

From the USGS Earthquake Hazards Program and its partner networks, event us7000jman (also filed as ak0233ht3ve1). Read Thu, Oct 1, 2026, 7:58 AM UTC.