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The geophysical methods section of the
website presents a more comprehensive discussion of the geophysical methods and
theory. This section is divided into two broad categories, surface methods, and
borehole methods. To develop a complete understanding of the theory and science
of geophysical methods requires an understanding of the geephysical quantities
involved in the methodology.

The pages found under Surface Methods and
Borehole Methods are substantially based on a report produced by the US Army
Corps of Engineers titled Geophysical Exploration for Engineering and
Environmental Investigations, 1995, Report number EM 1110-1-1802.

Geophysical Quantities • Overview • Electrical Conductivity and Resistivity • Magnetic Susceptibility • Density • Porosity • Seismic Velocities • Reflectivity • Geomechanical (Engineering) Properties Surface Methods • Overview • Potential Field Methods • Seismic Methods • Electrical Methods • Electromagnetic Methods • Nuclear Methods

Borehole Methods • Overview • General In-Hole Procedures • General Crosshole Procedures • Surface To Borehole Procedures • Logging Techniques and Tools