Electromagnetic inversion for environmental site characterization: Data quality versus image resolution

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Non-linear electromagnetic inversion schemes have been developed to produce 2D and 3D images of subsurface conductivity structure from electromagnetic geophysical data. The solutions are obtained by successive linearized model updates where full forward modeling is employed at each iteration to compute model sensitivities and predicted data. Regularization is applied to the problem to provide stability. The use of the inversion is demonstrated on a data set collected with the Apex Parametrics MaxMin I-8S over a section of conductive waste at the Idaho National Laboratory`s Cold Test Pit. The out-of -phase data are of very good quality while the in-phase are ... continued below

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5 p.

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Alumbaugh, D.L. & Newman, G.A. October 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Non-linear electromagnetic inversion schemes have been developed to produce 2D and 3D images of subsurface conductivity structure from electromagnetic geophysical data. The solutions are obtained by successive linearized model updates where full forward modeling is employed at each iteration to compute model sensitivities and predicted data. Regularization is applied to the problem to provide stability. The use of the inversion is demonstrated on a data set collected with the Apex Parametrics MaxMin I-8S over a section of conductive waste at the Idaho National Laboratory`s Cold Test Pit. The out-of -phase data are of very good quality while the in-phase are rather noisy due to slight mispositioning errors. A resolution study on synthetic data indicates that the error present in the in-phase data causes images of far lower resolution with more artifacts than if the in-phase and out-of-phase components are of similar quality. Better resolution images result if the data are weighted proportional to frequency; this gives each frequency equal importance. The loss of resolution due to poor quality in-phase data is demonstrated in a 3D inversion of the MaxMin data which shows both artifacts forming outside of the area known to contain the buried waste, as well as an inability to resolve depths.

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5 p.

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INIS; OSTI as DE97007272

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  • 3. meeting environmental and engineering geophysics-European section, Aarhus (Denmark), 8-11 Sep 1997

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  • Other: DE97007272
  • Report No.: SAND--97-1710C
  • Report No.: CONF-970985--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 532453
  • Archival Resource Key: ark:/67531/metadc691111

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 14, 2016, 3:46 p.m.

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Alumbaugh, D.L. & Newman, G.A. Electromagnetic inversion for environmental site characterization: Data quality versus image resolution, article, October 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc691111/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.