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    • Keywords


      Resistivity; inverse solution

    • Abstract


      The paper presents a fast automatic approach to solve the inverse resistivity problem, assisted by optimization, which is a non-linear model-fitting technique. The selected inverse problems are ill-posed and the inverse solution is defined by ‘best fit’ in the sense of least-squares. Formulations are presented in a systematic manner for Newton’s method, least squares method and Marquardt’s modification (ridge regression) method based on local linearization of non-linear problem. The convergence of least-squares method and Marquardt’s method, to provide a robust solution, are first tested on a theoretical model and effectiveness of Marquardt’s method is demonstrated, and then two-field apparent resistivity curves from Banda district, India are interpreted and discussed.

    • Author Affiliations


      Sri Niwas1 Pawan Kumar1 H R Wason1

      1. Department of Earth Sciences, University of Roorkee, Roorkee - 247 672, India
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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