M3.1 earthquake 134 km SE of Old Harbor, Alaska

A magnitude 3.1 earthquake struck 134 km SE of Old Harbor, Alaska on Mon, Dec 23, 2019, 12:51 AM AKST (09:51 UTC), 19 km (11 mi) below the surface.

A larger quake followed: M5.0 217 km SSE of Old Harbor, 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
3.1	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.2	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.046 · 62 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: 6 in the 60 days after this one and 33 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak019gekiuvd (also filed as us70006q43). Read Thu, Oct 1, 2026, 3:18 AM UTC.