The Effect Of Air In The Numerical Solution Of The Te Mode Of The Magnetotelluric Method

We present the numerical solution of the model of<br>an infinite fault for the TE mode using the finite<br>elements method to investigate the effect of the air in<br>the TE solution. We compare our solution for the<br>normalized electric field with one approximated<br>analytic solution, which neglects the effect of the air,<br>and with another exact semi-analytic solution. The<br>latter comparison shows a difference that cannot be<br>explained by numerical errors. Examining the effect<br>of the air on apparent resistivity, we compare three<br>profiles of apparent resistivity obtained with our FE<br>solution with the profiles obtained using the<br>approximated solution. The discrepancy between the<br>apparent resistivities shows to be small, figuring in<br>the range of the instrumental field error.