You can go to the USGS earthquake site and report that you felt it.
https://earthquake.usgs.gov/earthquakes/eventpage/us1000hyfh/executive#dyfi
As an aside, when I zoomed in to the Anchorage area, it shows 45 total quakes in and around that area for the last day, and two within the last hour. All within about a 15 mile radius of the big one.
Thanks for the link!
The Tectonic Summary at the bottom is very interesting!