“The largest event of the swarm occurred on March 9 at 2.29pm (MST) and was located nine miles north-northwest of Old Faithful.”
Earthquake swarms typically account for about 50 percent of all seismic activity in Yellowstone.
Within this time period, Steamboat Geyser erupted on March 3, 18, and 27, bringing this year’s number of eruptions up to seven.
Steamboat Geyser is a fan-favourite staple of the US national park and is the world’s tallest active geyser.
The USGS said: “During winter months, the interval between Steamboat eruptions is longer than during the summer, probably due to lower groundwater levels in the absence of runoff from snow melt.