12 April 2002 Amplitude and waveform analysis of repetitive GPR reflections: a Lake Bonneville delta, Utah
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Proceedings Volume 4758, Ninth International Conference on Ground Penetrating Radar; (2002) https://doi.org/10.1117/12.462282
Event: Ninth International Conference on Ground Penetrating Radar (GPR2002), 2002, Santa Barbara, CA, United States
Abstract
Recent theoretical studies have shown the sensitivities of the amplitude and waveform of a GPR reflection to the contrast in electromagnetic properties across the reflecting contact. In geological applications, however, extracting information about contrasting properties across a contact from a reflected pulse is generally difficult. Uncertainties stem largely from lack of information about the form of the outgoing pulse and lack of knowledge of the electromagnetic properties of media on both sides of the contact. Here we show that in a setting with repetitive layering, these uncertainties can be significantly reduced. An example is shown for 50, 100, and 200 MHz profiles that image subparallel dipping bedding planes in gravelly deltaic foreset facies on a Lake Bonneville delta, Utah, USA. Strongly reflecting horizons with 1-2 m spacings bound packages with finer internal layering. From finite-difference time-domain simulations of radar wave propagation, constraints can be placed on the variations in permittivity across the primary and finer-scale layering. Modeling the relative amplitudes of reflections demonstrates that the finer-scale permittivity contrasts are ~0.4-0.8 times that of the 1-2 m layering. Amplitude-versusoffset (AVO) analysis yields an upper bound of ~3.5 for the contrast in permittivity at larger-scale boundaries. Overall signal attenuation indicates the average conductivity is ~0.7-0.8 mS/m.
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Sarah E. Kruse, Sarah E. Kruse, Harry M. Jol, Harry M. Jol, } "Amplitude and waveform analysis of repetitive GPR reflections: a Lake Bonneville delta, Utah", Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); doi: 10.1117/12.462282; https://doi.org/10.1117/12.462282
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