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18-Geol-A7 Applied Geophysics: May 2013

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Geophysical Terms
  2. Question 2 Method Selection for Five Applications
  3. Question 3 Airborne Radiometrics and a Gamma-Ray Spectrum
  4. Question 4 Time-Domain EM — Large-Loop Transmitter and Plate Response
  5. Question 5 Detecting a Thin Middle Layer — Three Methods, and the Equivalence Principle
  6. Question 6 Magnetic Anomaly Interpretation and Instrument Comparison
  7. Question 7 Gravity Survey Over a Suspected Tunnel — Horizontal Cylinder Model
  8. Question 8 Seismic Refraction — Apparent Velocities, Earth Models and Depth to Bedrock

Start with Question 1 →

National Exams — May 2013 — 04-Geol-A7 Applied Geophysics. Three-hour, open-book exam; any non-communicating calculator permitted. Part I (Questions 1–4) is compulsory; Part II states "answer any THREE of Questions 5–8," but all eight questions, and every lettered/numbered sub-part, are solved below. Two figures (the gravity profile of Q7 and the seismic time-distance graph of Q8) are read from the printed exam page; the reading tolerance is given in a check callout beside each.

Reference texts: Telford, Geldart & Sheriff, Applied Geophysics (2nd ed.) — the primary reference for every method in this paper (seismic refraction/reflection, gravity, magnetics, electrical/resistivity, EM, radiometrics); Kearey, Brooks & Hill, An Introduction to Geophysical Exploration (3rd ed.) — method-selection and field-procedure context; Blakely, Potential Theory in Gravity and Magnetic Applications — the horizontal-cylinder gravity formula and magnetic-anomaly shape analysis used in Q6–Q7.