One of the strongest earthquakes to strike Alaska since the November 2018 quake in Anchorage occurred near Adak Saturday evening. The magnitude 6.3 earthquake struck just 59 miles southeast of Adak at a depth of 16.1 miles.

No tsunami occurred as a result of the strong quake, however, several aftershocks have been taking place. There have also been no reports of damage.

At least eight aftershocks have occurred since the mainshock, with two of them coming within 10 minutes of the original quake. The majority of the aftershocks have been anywhere from a magnitude 3.0-3.6. It's possible that additional smaller aftershocks — many of which will likely not be felt — will occur through the weekend. According to the USGS, within the next year there is a 53-percent chance that a few of those aftershocks could be of magnitude 5.0 or higher.

 
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The Aleutians are prone to some of the world's largest earthquakes. This is due to the tectonic setting of where the Aleutian Islands lie. The Alaska-Aleutian Megathrust is one of the largest fault lines in the world and is responsible for some of the strongest earthquakes ever recorded. The most notable is the 1964 Good Friday earthquake that caused catastrophic damage in Southcentral. 

A list of the strongest earthquakes to occur since the November earthquake are as follows:

Magnitude Distance Location Date
7.1 8.6 miles NNW Anchorage Nov. 30, 2018
6.4 19.8 miles ENE Kiska Volcano April 2, 2019
6.3 59 miles SE Adak Nov. 23, 2019
6.0 70.8 miles SE Cold Bay Dec. 31, 2018
6.0 37.2 miles E Amatignake Island May 23, 2019


Did you feel it? If so, let the USGS know here

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