Field studies and scale modeling using cross-borehole electromagnetic diffraction probing
AuthorGoedecke, Walter, 1954-
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PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractThe scope of these studies encompasses both field site testing and scale modeling. The purpose was to better understand the complexities of electromagnetic diffraction geotomography, or the imaging of ground between boreholes using electromagnetic waves. Two field sites and a scale model tank were investigated. One field site, the San Xavier Mine facility, is located in metamorphosed paleozoic limestone. This site proved a challenge in that the medium was fairly inhomogeneous and resulted in server wave scattering. Inter-borehole transmission allowed only 15 MHz to penetrate for an adequate signal level. Both a parallel scan and geotomography of targets produced inconclusive results. The Apache Leap site contained a homogeneous quartz-latite tuff, allowing penetration of 150 MHz. Parallel scans of a metal pipe target, proved that alterant geotomography, or scans performed before and after tracer injection, was a possibility for future studies. The model tank allowed the use of horizontal dipole antennas, a coil substitute. Target effects produced strong interference patterns.