Auxiliary material for Paper # 2012JB009833 Eruptions at Lone Star Geyser, Yellowstone National Park, USA, Part 1: Energetics and Eruption Dynamics Leif Karlstrom^1, Shaul Hurwitz^2, Robert Sohn^4, Jean Vandemeulebrouck^3, Fred Murphy^2, Maxwell L. Rudolph^7, Malcolm J. S. Johnston^2, Michael Manga^5, R. Blaine McCleskey^6 1. Department of Geophysics, 397 Panama Mall, Stanford University, Stanford, CA 94305. 2. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 3. ISTerre, Universite de Savoie, CNRS, F-73376 Le Bourget-du-Lac, France 4. Woods Hole Oceanographic Institute, 266 Woods Hole Rd, MS$\#$ 24, Woods Hole, MA 02543 5. Department of Earth and Planetary Science, 307 McCone Hall University of California at Berkeley, Berkeley, CA 94720 6. U.S. Geological Survey, 3215 Marine St., Suite E. 127, Boulder, CO 80303 7. Department of Physics, 390 UCB University of Colorado, Boulder, CO 80309 [Journal Reference, exactly following journal article, including DOI (10.1029/).] TO BE COMPLETED UPON ACCEPTANCE Introduction: Auxiliary material contains two types of data from 32 eruptions at Lone Star geyser, Yellowstone National Park, recorded over 4 days in September 2010. The first is eruption start times in UTC, determined by a series of infrared (IR) sensors pointed just above the geyser cone (described in main text). These eruption times are determined via thresholding of IR data corrected for diurnal variability. Start time data include a gap (eruptions 20-23 on September 23) due to instrumental failure. For these eruptions we used Forward Looking Infrared (FLIR) footage and acoustic data to determine eruption times. The second data set included in this file is time varying discharge from outflow channels around the geyser. A rating curve was established to calibrate pressure transducers (labeled xdcr in the file) in the two largest channels (methods detailed in text), which operated continuously for all 32 eruptions. Smaller outflow channels and a complete inventory of discharge was undertaken for 9 eruptions only. These measurements allow us to establish relative timing between eruptive phases, volume of eruptive phases, and the lag between stream discharge and eruption from the geyser cone. Finally, there is a file containing two supplementary figures and one data table. These figures and table are referred to in the text, and provide additional details on water isotopes at Lone Star Geyser as well as error estimation for the PIV video processing. The data table lists major element water chemistry for Lone Star Geyser area streams, along with reservoir temperature calculations. References specific to these figures are also included. Text Files: One tab delimited text file containing 41 columns of data. These labeled columns include eruption number (consecutive from beginning of instrumental deployment), IR eruption start times, discharge measurements and durations of each eruptive stage, as well as stream base flow. Data are summarized by mean value, standard deviation and extrema for each phase and time interval. Discharge data are also used to derive start times for the eruptions (onset of higher flows) which are compared to IR start times. We provide a key linking the eruption stage sequence (1-4) proposed in the text to steam discharge stages.