The model consists of an conductive overburden overlying 2 quarter-spaces. Movie 3 shows current density propagating in space and time for a vertical magnetic dipole source on the surface. The model consists of an Oil-Water contact at depth in a layered earth structure. Movie 4 shows the propagation of the impulse response of the magnetic field in space and time. The source is a grounded electric bipole on the surface.
Solid lines show the host and the target.
Dashed line shows the borehole. Field amplitudes are normalized, red color corresponds to maximum, blue color corresponds to the minimum. As you can see, the dynamic of the field is very different.