2D unstructured inversion of MT/RMT data

What is it about?

2D inversion speed and accuracy are very important factors for starting to develope 3D inversion in MT/RMT methods. In this study, We compare first-time structured and unstructured grid-based magnetotelluric and radiomagnetotelluric data inversion results according to speed and accuracy, which shows that the unstructured grid-based inversion algorithm finds the solution faster and the boundaries and resistivity values closer to the true a priori synthetic model than the conventional structured grid-based inversion algorithm.

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Why is it important?

The undulated surface topography and complex underground resistivity structure could be defined more accurately with fewer elements than a structured mesh-based algorithm. Triangle parameters become larger in the vertical and horizontal directions for the unstructured grids. Therefore, the quality of the mesh is increased, and the numerical calculation errors are reduced. Due to the decreased number of elements, over-parameterization is avoided, and the resolution of the parameters is improved. Thus, unstructured mesh-based inversion determined closer resistivity values to the true model than did the structured mesh-based inversion.

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