M3.7 earthquake 169 km ESE of Atka, Alaska

A magnitude 3.7 earthquake struck 169 km ESE of Atka, Alaska on Wed, Jul 31, 2019, 1:45 PM HADT (22:45 UTC), 49 km (30 mi) below the surface.

A larger quake followed: M4.1 177 km E of Atka, 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
3.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.084 · 36 stations
3.4	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: 17 in the 60 days after this one and 5 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us60004yaw (also filed as ak0199qzauuv). Read Fri, Oct 2, 2026, 2:45 AM UTC.