Lecture 19 Magnetotellurics.

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Presentation transcript:

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.