• Seismic
  • Reflection
  • Refraction
  • MASW (surface wave analysis)
  • P & S wave velocities
• Ground Penetrating Radar
• Magnetics 
• DC Resistivity
  • In-situ soil resistivity
  • Sounding
  • Profiling
• Electromagnetic Induction
  • Time Domain (metal detection)
  • Frequency Domain (terrain conductivity)

Method Descriptions

Environmental and Engineering Geophysical Society - What is geophysics?

U.S. Department of Transportation - Geophysical Methods

Transportation Research Board - Geohysical Methods (pdf)

New Transmission Line

depth to bedrock 

seismic velocities

MASW