ES734/834 Exam IV, 2002

Do #1, 2, 3 Plus TWO MORE

1. Explain how and why the acceleration of gravity ("g") varies with latitude.

2. Explain why we use Bouguer anomalies for exploration instead of Free Air anomalies. Be sure to include a definition of each.

3. Derive a formula for the gravitational effect (that is, the vertical component of Newtonian attraction) of a buried sphere.

4. Explain two methods for separating regional and residual fields. What are the pros and con's of each method?

5. What are some advantages of using (various components of) gravity gradient anomalies rather than gravity anomalies?

6. Write a brief proposal for a gravity project that you would like to carry out. Include purpose, geology, methods, data analysis and expected results.

7. What are the pros and con's of exploring for buried glacial valleys using gravity, resistivity and seismic methods. Assume flat terrain. THe valleys are cut into sedimentary rock, have widths of about 1000m and depths of 50-100m and are filled with unconsolidated sediments.