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05-Geol-B10: December 2016

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

  1. Question 1 Aliasing in Gravity/Magnetic Survey Design
  2. Question 2 Time Scales of Magnetic Field Variation
  3. Question 3 Planning and Executing a Gravity Survey — Drift and Tidal Removal
  4. Question 4 IGRF versus DGRF
  5. Question 5 Gravity Meter Principles and Gravity Gradiometry
  6. Question 6 Induced versus Remanent Magnetization
  7. Question 7 Vertical Derivative versus Analytic Signal Amplitude
  8. Question 8 Case History — Gravity for a Geotechnical/Engineering Problem
  9. Question 9 Regional-Residual Separation
  10. Question 10 Non-Uniqueness in Potential-Field Interpretation

Start with Question 1 →

EGBC National Exam — Geological Engineering, 04-Geol-B10-1 Gravity and Magnetic Fields, 2016-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 and gravity reduction ch.2; magnetometers and magnetic surveying ch.4–5; forward/inverse modelling throughout); Kearey, Brooks & Hill, An Introduction to Geophysical Exploration, 3rd ed. (survey design, data processing and interpretation workflow ch.6 & 7); Blakely, Potential Theory in Gravity and Magnetic Applications (potential-field theory, uniqueness/equivalent sources ch.5, Fourier-domain filters ch.9 & 12).