Earthquake swarm reported in Millard County April 19

KANOSH — A cluster of small earthquakes was recorded last week in Millard County near the town of Kanosh, according to the University of Utah Seismograph Stations.

The swarm began early Sunday morning, April 19, and included more than 30 quakes over several hours. The largest magnitude measured was 3.6 and occurred shortly before 9 a.m. Several other tremors ranged between magnitudes 2.0 and 3.0.

No injuries or property damage were immediately reported. Events of that size can sometimes be felt by nearby residents but typically do not cause significant damage.

Earthquake swarms differ from the more familiar pattern of one larger quake followed by aftershocks. In a swarm, numerous small quakes occur in a concentrated area over a short period, often without a single dominant mainshock.

Utah lies within the Intermountain Seismic Belt, a region of ongoing earthquake activity stretching through much of the state and neighboring areas. Small to moderate earthquakes are recorded in Utah each year, though many are too minor to be widely noticed.

Millard County has experienced similar activity in the past because of the area’s active geology and fault systems. Scientists note that swarms can subside quickly or continue intermittently for days.

Officials had not issued any public safety warnings related to the recent activity. Residents are often encouraged to review emergency plans and secure heavy household items as a general earthquake preparedness measure.