M1.6 earthquake 123 km W of Adak, Alaska

A magnitude 1.6 earthquake struck 123 km W of Adak, Alaska on Sat, Sep 22, 2018, 1:15 PM HADT (22:15 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M4.8 126 km WSW 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 200 in the 60 days after this one and 149 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak018c6mltt2. Read Thu, Oct 1, 2026, 10:41 PM UTC.