Richard Heermance, Department of Geological Sciences, California State University Northridge, Northridge, CA, Scott Johnston, Physics Department, California Polytechnic State University, San Luis Obispo, CA, John Singleton, Department of Geosciences, Colorado State University, Fort Collins, CO, Jacob Thacker, New Mexico Bureau of Geology and Mineral Resources, Socorro, NM, Kevin Hobbs, New Mexico Bureau of Geology, Theresa Schwartz, United States Geological Survey, Denver, CO and Nikki M. Seymour, Department of Geological Sciences, Stanford University, Stanford, CA