M1.7 earthquake 146 km WSW of Adak, Alaska

A magnitude 1.7 earthquake struck 146 km WSW of Adak, Alaska on Tue, Jan 21, 2020, 4:36 PM HAST (02:36 UTC), 26 km (16 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.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: at least 201 in the 60 days after this one and 74 in the 30 days before it.

The first 60 of at least 201.

From the USGS Earthquake Hazards Program and its partner networks, event ak02010f8bi5. Read Sat, Oct 3, 2026, 6:17 AM UTC.