During April 2016, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 53 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a micro earthquake of magnitude 2.0 on April 23, 09:48 PM MDT, located 4 miles north of Norris Geyser Basin, YNP.
April 2016 seismicity included a small earthquake swarm of 11 earthquakes occurring on April 17 (MDT). The largest swarm earthquake (magnitude 1.5) occurred April 17, 2016 6:48 AM MDT, located 8 miles east of West Thumb, WY.
A small amount of ground uplift (~ 1 cm) has been recorded to the north of the Yellowstone Caldera on the NRWY (Norris GPS station). The uplift appears to have started early in 2016 and the apparent pattern is similar to that observed in 2013/2014. Most of the GPS stations within the caldera record slight subsidence, at a rate of ~1.5 cm/yr.
Current deformation patterns at Yellowstone remain within historical norms.
Source : YVO