1. Lecture 19
Magnetotellurics

2. Magnetotellurics

3. Alternatively without imaginary j (After Telford et al.,)

5. CURL

6. Magnetotellurics Theory (After Telford et al.,)

7. 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.