M4.4 earthquake 93 km W of Adak, Alaska

A magnitude 4.4 earthquake struck 93 km W of Adak, Alaska on Mon, Jan 20, 2020, 5:26 PM HAST (03:26 UTC), 78 km (49 mi) below the surface.

A larger quake followed: M6.2 84 km W of Adak, 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
4.4	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.048 · 127 stations
4.0	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: at least 200 in the 60 days after this one and 69 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event us60007buu (also filed as ak020ys891s). Read Thu, Oct 1, 2026, 3:35 AM UTC.