M3.5 earthquake 131 km WSW of Adak, Alaska

A magnitude 3.5 earthquake struck 131 km WSW of Adak, Alaska on Sat, Jul 23, 2022, 7:44 PM HADT (04:44 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.8 145 km WSW 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
3.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.097 · 14 stations
3.1	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: 185 in the 60 days after this one and 136 in the 30 days before it.

The first 60 of 185.

From the USGS Earthquake Hazards Program and its partner networks, event us6000iia8 (also filed as ak0229f3tddu). Read Fri, Oct 2, 2026, 1:53 AM UTC.