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DC resistivity inversion constrained by magnetic method through sequential inversion

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Abstract

In the inversion of geophysical data, an attempt is made to obtain a model with the best fit on the observed data. Unfortunately, the results are usually accompanied by non-uniqueness and ambiguity. These inversion problems can be reduced by inverting different geophysical datasets. Sequential inversion is one of the most common ways to integrate two or more geophysical datasets, to obtain a model that is compatible with all geophysical data, thus reducing the amount of ambiguity. This paper presents separate inversions of DC resistivity and magnetic data and sequential inversion of DC resistivity constrained by magnetic data. Here, the inverse model of magnetic data is considered the initial model for the sequential inversion of DC resistivity data. At first, the algorithm is applied to a synthetic model composed of four conductive and magnetized bodies, and the results show notable improvement for the resistivity model after sequential inversion, compared with the separate resistivity inversion model. Finally, encouraged by the results obtained in the synthetic case, the algorithm was applied to DC resistivity and magnetic datasets that were collected in the archeological area of old Pompeii city nearby Naples, Italy. The result of the sequential resistivity inversion model was notably superior to the corresponding resistivity model obtained from standard separate inversion.

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Authors and Affiliations

  1. Institute of Geophysics, University of Tehran, Tehran, Iran

    Ramin Varfinezhad & Mehdi Mohammadi Vizheh

  2. Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università di Napoli ‘Federico II’, Naples, Italy

    Saeed Parnow, Giovanni Florio & Maurizio Fedi

Authors
  1. Ramin Varfinezhad
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  2. Saeed Parnow
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  3. Giovanni Florio
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  4. Maurizio Fedi
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  5. Mehdi Mohammadi Vizheh
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Correspondence to Saeed Parnow.

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Edited by Dr. Mario Zarroca Hernández (ASSOCIATE EDITOR) / Prof. Gabriela Fernández Viejo (CO-EDITOR-IN-CHIEF).

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Varfinezhad, R., Parnow, S., Florio, G. et al. DC resistivity inversion constrained by magnetic method through sequential inversion. Acta Geophys. 71, 247–260 (2023). https://doi.org/10.1007/s11600-022-00909-1

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  • DOI: https://doi.org/10.1007/s11600-022-00909-1

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