Do #1, 2, 3 Plus #4 Or 5 Plus #6 OR 7

1. Sketch anomalies (South-North profiles) over a spherical source for these situations (I= inclination in degrees; M=magnetization direction in degrees):

A. I=90, M=90 B. I=30 M=30 C. I=0, M=90.

Be sure to label sketches completely and to explain the theory behind them.

2. Explain induced magnetization and susceptibility. How are they related? What are the units of each?

3. Describe the diurnal variation of the magnetic field of the earth and how we can account for it in magnetic surveys.

4. Derive seismic refraction travel-time curves for a layer over an infinite half-space. Use completely labelled sketches to show ray paths and travel-time curves.

5. Derive seismic reflection travel-time curves for a layer over an infinite half-space. Use completely labelled sketches to show ray paths and travel-time curves.

6. Sketch resistivity sounding curves for a Wenner array and these three situations:

A. dry sand/wet sand/bedrock

B. damp clay/dry sand/wet clay

C. permafrost/wet sand/wet clay

Label the graphs completely and explain each one.

7. Compare and contrast ground-penetrating radar profiling and common-offset seismic reflection profiling. Include theory, field procedures, data analysis, applications, and so on.