Magnetotellurics is the recording and study of naturally occurring electric and magnetic fields at the Earths’s surface. If the curie point in the crust is on average between 10-30 km how can this affect the low-frequency (< 10^-2 Hz) measurements?
In any case, the earth's field is not uniform.
This is due, to the reliefs, soils and waters,......
But it is also possible that the plasma constituting the core of the earth has a role in these earthy field fluctuations.
Agree with Andreas... MT is only sensivity to large volume conductance changes.. At the depth where Currie point becomes important the volume is HUGE and the signal is smeared... You would also get a sharp resistivity contrast which means a small volume would be seen as big volume with lower resistivity causing more depth confusion...
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