GEOPHYSICS FIELDS METHODS
GEOPHYSICS FIELD METHODS
(Course Outline: 2007)
San Diego State University
George R. Jiracek
DC Resistivity
Electromagnetic quantities and units
Vector review
Ohm’s law: current flow, current density, voltage, equipotentials, resistance
Resistivity of Earth materials
Measuring Earth resistivity: Wenner, Schlumberger, and dipole-dipole arrays
Apparent resistivity versus true resistivity
Lab: field resistivity survey
Geophysical modeling: forward and inverse
Resistivity survey modeling and report writing assignment
Gravity
Planetary motion and Newton’s universal law of gravity
Gravity quantities and units
Rock densities
Definitions of gravity anomalies (more than one)
Gravitational equipotential surfaces: geoid and spheroid
Gravity meters
Lab: field gravity survey
Gravity modeling and report writing assignment
Gravity anomalies over simple bodies
Lab exercise: sketching gravity anomalies over various features
Bouguer anomalies over continents and oceans
Excess mass calculation
Geomagnetism
Comparison of geomagnetism and gravity
Magnetic quantities and units
Elements of geomagnetic field (external and internal)
Definition of magnetic anomaly
Magnetic anomaly patterns
Induced and remanent magnetism
Rock magnetism
Magnetometers
Lab: field magnetic survey
Magnetic modeling and report writing assignment
Lab exercise: sketching magnetic anomalies over various features
Refraction Seismics
Basic principles of reflection and refraction seismics
Seismic waves, wavefronts, rays, reflection coefficient, Snell’s law
Velocities of rocks
Refraction time-distance (t vs. x) curves: head wave, apparent velocities
Single, horizontal layer velocity and depth calculations
Extensions to multi-dipping layers and irregular interfaces
Lab exercise: sketching t vs. x curves for various features
Reflection Seismics
Practical comparisons of reflection and refraction seismics
Introduction to digital analysis – digital seismograph
Lab: field reflection/refraction survey
Seismic refraction modeling and report writing assignment
Interval, average, and stacking velocities
Reflection seismic processing: static and normal moveout corrections, common midpoint (CMP) stacking, migration
Introduction to filtering: synthetic seismogram
Vibroseis system: cross- and autocorrelation, correlogram
Lab exercise: sketching unmigrated seismic sections
Fourier analysis: time and frequency domains
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