M3.9 earthquake 202 km SE of Chignik, Alaska

A magnitude 3.9 earthquake struck 202 km SE of Chignik, Alaska on Sun, Dec 7, 2025, 3:22 AM AKST (12:22 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M4.2 191 km SE of Perryville, 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
3.86	ML, local (Richter)	Alaska Earthquake Center	Preferred · Reviewed · ±0.2592612200632082 · 27 stations
3.6	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.189 · 7 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 3 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak2025ybbntw (also filed as us6000rt50). Read Fri, Oct 2, 2026, 7:17 PM UTC.