The design of structural coupling operators for joint inversion on irregular meshes is a non-trivial task. We propose to use a neighbourhood approach to calculate the model-gradients that are needed for the cross-gradients coupling constraints. Our joint inversion algorithm is applied to 3D synthetic crosshole GPR traveltime and apparent resistivity data. The joint inversion results are compared to the results of individual inversions of the two data sets and the performance of the inversions is assessed by comparing the tomograms to the true model and the petrophysical distribution of the geophysical properties. Using joint inversion, we observe less deviation from the true models as well as a closer match with the true distribution of the property fields.


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