M1.9 earthquake 146 km W of Adak, Alaska

A magnitude 1.9 earthquake struck 146 km W of Adak, Alaska on Thu, Oct 31, 2019, 1:49 AM HADT (10:49 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M6.0 127 km SW 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
1.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.58	ML, local (Richter)	AV	Final · ±0.269 · 13 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 127 in the 60 days after this one and 97 in the 30 days before it.

The first 60 of 127.

From the USGS Earthquake Hazards Program and its partner networks, event ak019dyxmfx7 (also filed as av62101296). Read Fri, Oct 2, 2026, 9:42 AM UTC.