M4.3 earthquake 185 km E of Atka, Alaska

A magnitude 4.3 earthquake struck 185 km E of Atka, Alaska on Sun, Nov 9, 2025, 4:20 AM HAST (14:20 UTC), 50 km (31 mi) below the surface.

A larger quake followed: M4.4 121 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
4.3	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.188 · 9 stations
3.9	ML, local (Richter)	Alaska Earthquake Center	Preliminary

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 14 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 us6000rmhz (also filed as ak025edvo3h0). Read Sat, Oct 3, 2026, 1:08 PM UTC.