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18-Geol-B10: December 2019

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

  1. Question 1 The Controlling Physical Property in the Magnetic Method
  2. Question 2 The Earth's Magnetic Field as a Function of Latitude
  3. Question 3 Planning and Executing a Ground Gravity Survey — Drift and Earth-Tide Corrections
  4. Question 4 Why Gravity Varies with Latitude on a Spinning, Non-Spherical Earth
  5. Question 5 Magnetometer versus Magnetic Gradiometer
  6. Question 6 Time Scales of Magnetic Field Variation and Their Effect on Surveys
  7. Question 7 The Tilt Angle and Tilt-Derivative Transformation of Magnetic Data
  8. Question 8 Case History — Gravity Methods for a Geotechnical or Engineering Problem
  9. Question 9 Regional–Residual Separation
  10. Question 10 Image Processing for Gravity and Magnetic Data — Colour Stretch and Enhancement

Start with Question 1 →

EGBC National Exam — Geological Engineering, 18-Geol-B10-1 Gravity and Magnetics Fields, 2019-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, drift and tidal correction ch.2; magnetometers, gradiometers and magnetic surveying ch.4–5; anomaly enhancement and interpretation throughout); Kearey, Brooks & Hill, An Introduction to Geophysical Exploration, 3rd ed. (survey design, temporal-variation correction, case-history applications ch.6 & 7); Blakely, Potential Theory in Gravity and Magnetic Applications (potential-field theory, derivative and Fourier-domain filters, regional-residual separation ch.2, 9 & 12).