M2.5 earthquake 80 km ESE of Adak, Alaska

A magnitude 2.5 earthquake struck 80 km ESE of Adak, Alaska on Thu, Aug 22, 2019, 11:56 PM HADT (08:56 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.0 93 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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.5	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: 137 in the 60 days after this one and 55 in the 30 days before it.

The first 60 of 137.

From the USGS Earthquake Hazards Program and its partner networks, event us70005dpg (also filed as ak019asse34w). Read Fri, Oct 2, 2026, 8:02 PM UTC.