We are deploying seismometers on the lake floor to measure small earthquakes generated by hydrothermal fluid flow and to understand how they may migrate along fault surfaces. This is the first time that a seismometer will be deployed in the lake, so we don’t know what kind of noise levels and event rates to expect in the data. Before deploying a full-scale seismic network in 2017, our goal this year is to measure the noise levels and establish event rates during a ~1 month period from July to August. Photos by Rob Sohn, WHOI. Work was completed under an authorized Yellowstone Research Permit.