This vigorous earthquake swarm began rather suddenly in early-mid February 2019 in the Purcell Mountains, roughly between Shungnak and Huslia in Western Alaska. The activity peaked in March (an average of 40 events per day) and October with a pair of magnitude 5.3-5.5 earthquakes in each month respectively. This swarm contributed over 10% of events towards the 2019 total, with the majority of the swarm events with magnitudes less than 3.

The strongest events were felt throughout the region, with reports from as far away as Fairbanks and Nulato.