Course Outline

Outline

Measuring Gravity
Data acquisition, reduction of gravity data
- station locations
- instrument, tidal and drift corrections
- free air correction
- Bouguer correction
- borehole gravity
- isostasy: free air vs. Bouguer anomalies
- Eotvos effect
- terrain (topographic) correction
- FAA, BA, CBA, IA
Anomaly separation and filtering
- smoothing
- gridding
- least squares
- Fourier filtering
Interpretation of gravity data
- uniqueness problem
- direct approach
- indirect methods
- simplifying density models
- gravity due to simple bodies
- solid angle method
- line-integral method
- chart methods
- computer-aided interpretation

History of magnetism
Similarities and differences with gravity
Basic definitions
The Earth's magnetic field
- spherical harmonic analysis of Earth's magnetic field
- International Geomagnetic Reference Field
- main magnetic field
- external field
- field elements
Rock magnetism
- susceptibility
- remanence: TRM, CRM, DRM
- paleomagnetism and effect on present-day field
Acquisition of magnetic data
- measuring susceptibility and magnetism
- land magnetic data
- marine magnetic data
- airborne magnetic data
Reduction of magnetic data
- diurnal correction
- drift correction
- regional correction
Interpretation of magnetic anomalies
- total field anomalies
- interpretation methods
- anomaly separation and filtering
- reduction to pole
- downward and upward continuation
- Poisson's formula
- magnetic field due to simple bodies
- solid angle method
- basement depth determinations
- computer-aided interpretation

V D.C. Electrical Resistivity (time allowing)