1. Department of Geophysical Engineering, Montana Tech, 1300 West Park Street, Butte, MT 59701, USA.
2. TechnoImaging, 4001 South, 700 East, Suite 500, Salt Lake City, UT 84107, USA.
3. Corresponding author.
4. Department of Geology and Geophysics, The University of Utah, 1450 East, 100 South, Salt Lake City, UT 84102, USA.