Seismic refraction survey at Apple Valley Landfill site, CA. Survey objectives were to map bedrock topography and a fault zone. The system shown is a EG&G Geometrics Es2401 Seismograph with a EG&G Geometrics Dynasource Vacum-Accelerated weight drop.
Seismic reflection survey conducted at Tinker AFB Northwest Quadrant, OK. Survey objectives were to map sand channels and lenses in the near surface.
Verical seismic profile survey conducted at Tinker AFB, OK. Survey objective was to tie seismic data to depth.

  Seismic Methods
FPM Geophysical and UXO Services geophysicists conduct high-resolution seismic refraction and seismic reflection surveys in support of a variety of engineering, environmental, and hydrogeologic investigations.

Seismic surveys are also a cost-effective way to extend information derived from borehole logs over a much larger area, minimizing the need for costly multiple borings. Crosshole seismic surveys are used to determine geotechnical properties of rock and soil. FPM Geophysical and UXO Services geophysicists typically use the generalized reciprocal method (GRM) to analyze high-resolution seismic refraction data. Seismic surveys are employed to:

  • Map stratigraphy
  • Detect faults in bedrock
  • Map bedrock topography
  • Estimate bedrock rippability
  • Estimate depth to groundwater
  • Determine thickness of overburden
  • Map lateral continuity of geologic strata
  • Conduct velocity analysis of overburden


    • Seismic Refraction Survey to Map Bedrock Topography