M2.5 earthquake 44 km NE of Adak, Alaska

A magnitude 2.5 earthquake struck 44 km NE of Adak, Alaska on Sun, Jul 21, 2019, 4:06 PM HADT (01:06 UTC), 145 km (90 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 · ±0.128 · 8 stations
2.1	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: 104 in the 60 days after this one and 53 in the 30 days before it.

The first 60 of 104.

From the USGS Earthquake Hazards Program and its partner networks, event us600055ps (also filed as ak0199bqq7sd). Read Fri, Oct 2, 2026, 9:40 AM UTC.