Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309-0390 United States
Department of Geological Sciences,Rutgers University, Wright Geological Laboratory, 610 Taylor Road, Piscataway, NJ 08854-8066 United States
Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309-0390 United States
Department of Geological Sciences, University of Colorado at Boulder, Benson Earth Sciences Building, Campus Box 399, Room 462C, Boulder, CO 80309 United States
Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309-0390 United States