M3.6 earthquake 30 km ESE of Atka, Alaska

A magnitude 3.6 earthquake struck 30 km ESE of Atka, Alaska on Sat, Jun 28, 2025, 12:36 PM HADT (21:36 UTC), 73 km (45 mi) below the surface.

A larger quake followed: M5.0 57 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
3.6	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.074 · 24 stations
3.3	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: 126 in the 60 days after this one and 61 in the 30 days before it.

The first 60 of 126.

From the USGS Earthquake Hazards Program and its partner networks, event us7000q9hm (also filed as ak02588dx28p). Read Sun, Oct 4, 2026, 8:04 AM UTC.