According to the US Geological Survey (USGS), Yellowstone National Park and its surrounding areas were struck by 134 earthquakes in April.
The strongest of the earthquakes peaked at magnitude 1.9.
The USGS also tracked a swarm of 20 earthquakes four miles south-southeast of West Thumb Geyser Basin.
The agency said: “During April 2020, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 134 earthquakes in the Yellowstone National Park region.
“The largest event was a minor earthquake of magnitude 1.9 located eight miles north of West Yellowstone, Montana, on April 3 at 9.27pm MDT.