Lecture 19 Magnetotellurics
Magnetotellurics
Alternatively without imaginary j (After Telford et al.,)
CURL
Magnetotellurics Theory (After Telford et al.,)
Wires connected to the ground are used to measure E Wires connected to the ground are used to measure E. A coil or magnetometer measures H at right angles. The data is band pass filtered at frequency to obtain apparent resistivity as a function of frequency. Then tomographic methods Are used to image resistvity at depth – similar to the resistivity surveys we did.