1. Geophysical Detection Programs, Sandia National Laboratories, 1515 Eubank Southeast, MS 0404, Albuquerque, New Mexico
87123, USA
2. Advanced Technologies Division, Nevada National Security Site, P.O. Box 98521, Las Vegas, Nevada 89193-8521,
USA
3. Nevada National Security Site, P.O. Box 98521,
Las Vegas, Nevada 89193-8521, USA
4. Department of Geological Sciences, 104 South Road, CB #3315, University of North Carolina, Chapel Hill, North Carolina 27599-3315,
USA