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04-Geol-B10: December 2017

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

  1. Question 1 Physical Property for the Gravity Method
  2. Question 2 Gravity Variation with Latitude
  3. Question 3 Planning and Executing a Magnetic Survey
  4. Question 4 Terrain Effects on the Bouguer Slab Correction — Hill and Valley
  5. Question 5 Principles of a Magnetometer — the Proton-Precession Instrument
  6. Question 6 Why Negative Gravity Anomalies Are Possible
  7. Question 7 Reduction to the Pole
  8. Question 8 Case History — Magnetic Methods for a Geotechnical Problem
  9. Question 9 Sun-Shaded (Sun-Angle) Images and Other Data Enhancement Methods
  10. Question 10 Non-Uniqueness in Potential Field Methods

Start with Question 1 →

EGBC National Exam — Geological Engineering, 04-Geol-B10-1 Gravity and Magnetic Fields, 2017-Dec. Closed book; no calculator permitted. All ten questions require an answer in essay format, with diagrams used wherever appropriate. The exam instructs "choose six (6) of the following ten (10) questions, the first six as they appear in the answer book will be marked, each of equal value".

Reference texts: Telford, Geldart & Sheriff, Applied Geophysics, 2nd ed. (physical properties ch.2 & 5; gravimeters, gravity reduction and terrain correction ch.2; magnetometers and magnetic surveying ch.4–5; anomaly interpretation throughout); Kearey, Brooks & Hill, An Introduction to Geophysical Exploration, 3rd ed. (survey design, diurnal correction, case-history applications ch.6 & 7); Blakely, Potential Theory in Gravity and Magnetic Applications (potential-field theory, Fourier-domain filters, reduction-to-pole, non-uniqueness ch.2, 5, 9 & 12).