5.4. Inversion

Here, the code e3d_v2_tiled.exe and the input file e3dinv.inp (see format) are used to invert Hz data. FEM data were created in the example “forward modeling”. Because we are doing a simple example, a floor uncertainty of 5e-10 A/m was added to all data. In practice, data are noisy and choosing appropriate uncertainties is very important for successful inversion. Files relevant to this part of the example are in the sub-folder inv. Before running this example, you may want to do the following:

• Download and open the zip folder containing the entire E3D version 2 tiled example (if not done already)

• Learn how to run code from command line

• Learn the format of the input file

To invert the synthetic data, the input file below was used:

The true model (left) and recovered model at iteration 6 (right). A cutoff of 0.001 S/m was used. The recovered model was sliced horizontally at an elevation of -200 m.