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UXO Detection and Prioritization Using Combined Airborne Vertical Magnetic Gradient and Time-Domain EM Methods

Publisher –
Society of Exploration Geophysicists (SEG) 2008, Annual International Meeting Proceedings, Las Vegas, Nevada.

Authors –
Jacob Sheehan*, Les Beard*, Jeffrey Gamey, William Doll, and Jeannemarie Norton, Battelle-Oak Ridge Operations

Paper – [pdf]  UXO_SEG_UXO_target_prioritization_LPB_2008

Summary
 In January 2008, low-altitude (~1-3 meters above ground level) airborne geophysical surveys were carried out at the Marine Corps Air Ground Combat Center (MCAGCC), near Twentynine Palms, California. The primary goal of the surveys was to assess the viability of airborne magnetic or electromagnetic geophysical surveys at MCAGCC for detection and mapping of unexploded munitions. Due to high magnetic content in the rocks and soils at MCAGCC magnetic methods had been shown in the past to have limited usefulness. The background magnetic conditions made this
site a good candidate for the use of a new 8-channel Time-domain Electromagnetic system (TEM8) developed by Battelle. The first phase of the project was an assessment of the efficacy of TEM8 and vertical magnetic gradient (VG-22) technologies, based on results from surveys of two 8 hectare areas and a 2 hectare geophysical prove out (GPO) area. This demonstration showed that both VG-22 and TEM8 were useful at this site, but the combination of the two datasets is more effective than either dataset used singularly for target prioritization.