M2.5 earthquake 99 km SW of Adak, Alaska

A magnitude 2.5 earthquake struck 99 km SW of Adak, Alaska on Fri, Aug 26, 2022, 8:43 PM HADT (05:43 UTC), 50 km (31 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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.105 · 12 stations
2.2	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: 195 in the 60 days after this one and 92 in the 30 days before it.

The first 60 of 195.

From the USGS Earthquake Hazards Program and its partner networks, event us6000iqw5 (also filed as ak022azcog1d). Read Fri, Oct 2, 2026, 6:46 PM UTC.