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Potential field data interpretation to detect the parameters of buried geometries by applying a nonlinear least-squares approach

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Abstract

The detection of buried geometrical model parameters is vital to full interpretation of potential field data, especially that related to gravity and/or self-potential anomalies. This study introduced a proposed non-linear least-squares algorithm for solving a combined formula for gravity and self-potential anomalies due to simple geometric shapes. This proposed algorithm was relied upon delimiting the origin anomaly value and two symmetric anomaly values with their equivalent distances along with the anomaly profile in order to invert the buried geometry model parameters. After that, a root mean square error (μ-value) for each parameter value at different postulated shape factor was assessed. The μ-value was considered as a benchmark for detecting the true-values of the subsurface geometry structures. The efficacy and rationality of the proposed approach were revealed by numerous synthetic cases with and without random noise. Furthermore, the sensitivity analysis between shape factor and μ-value were investigated on synthetic gravity and self-potential data. It was evident that the inverted parameters were reliable with the genuine ones. This proposed method was tested on samples of gravity data and self-potential data taken from Senegal and USA. To judge the satisfaction of this approach, the results gained were compared with other available geological or geophysical information in the published literature.

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Acknowledgements

The authors would like to thank Prof. Dr. Norbert Péter Szabó, Editor, and the two reviewers for their valuable comments on the manuscript, and for improvement of this work.

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Correspondence to Khalid S. Essa or Eid. R. Abo-Ezz.

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Essa, K.S., Abo-Ezz, E.R. Potential field data interpretation to detect the parameters of buried geometries by applying a nonlinear least-squares approach. Acta Geod Geophys 56, 387–406 (2021). https://doi.org/10.1007/s40328-021-00337-5

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