Investigating cooperative inversion of DC resistivity and EM۳۴ methods
Publish place: 21th Iranian geophysical conference
Publish Year: 1403
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
GCI21_204
تاریخ نمایه سازی: 1 بهمن 1403
Abstract:
Constraints and a priori information in regularization can reduce the uniqueness and instability of a geophysical approach, but obtaining sufficient information about subsurface sources typically requires the integration of two or more geophysical datasets. Cooperative inversion is one of the most popular methods for integrating geophysical data , where one method's inversion serves as the initial model for the inversion of the other method, and vice versa. This paper presents a cooperative inversion of DC resistivity and electromagnetic (EM۳۴) methods applied to data collected at the Morgenzon Farm site in South Africa. The main aim of this study is to reconstruct the Dolerite dyke or sill, which indicates the presence of groundwater.The individual inversion of DC resistivity data shows a two-layered medium as an interface and a small, weak outlier in the middle of the profile. On the other hand, the EM۳۴ inverse model shows a resistive dyke in the middle of the profile that is less than ۵ to ۱۵ m deep. Cooperative inversion enables the involved methods to interchange their characteristics. This paper demonstrates that among the cooperative inverse models of DC resistivity and EM۳۴, the cooperative inverse models of DC resistivity, constrained by the horizontal array of the EM۳۴ technique, yield the most effective results for reconstructing subsurface structures.
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Authors
Ramin Varfinezhad
University of Tehran, Institute of Geophysics
Saeed Parnow
School of Computing and Engineering, University of West London (UWL), London, UK
Seyed Hossein Hosseini
University of Tehran, Institute of Geophysics
Fabio Tosti
School of Computing and Engineering, University of West London (UWL), London, UK