3D joint inversion of complex geological structures: Example of a salt dome

We present results of three-dimensional joint inversion of first arrival traveltimes magnetotelluric impedances and gravity data over a marine salt dome. These complex structures are difficult to image with a single geophysical method and our results demonstrate how combining different techniques through a structural coupling constraint can result in improved models. We use two independent benchmarks to assess the quality of our results. A migrated seismic reflection section shows that our models match the geometry of the salt in the upper part well. In addition comparison with borehole logging data illustrates the improvement we can achieve over individual inversions.