Seismogram from station YTP in Yellowstone on July 15-16, 2021

Seismogram from station YTP in Yellowstone National Park showing earthquakes from the swarm beneath Yellowstone Lake that began late on July 15, 2021. Each row represents 30 minutes of seismic data. Vertical red lines indicate that the amplitude of the signal was truncated, or "clipped," to avoid obscuring the signal from events above it (earlier in time) or below it (later in time).