Woman at Helm of Inshore Boat

Geophysical Services

Williamson & Associates is an innovative, diversified geophysical consulting firm providing expert personnel and state-of-the-art equipment for a wide variety of scientific and engineering applications.


Williamson was founded in 1982 and has earned an excellent reputation of successful, innovative solutions to complex engineering and operational problems. Williamson has experienced continuous growth in capabilities for serving a client base of international, commercial, military and academic organizations.


Experience, creativity and commitment to quality have established Williamson as a leader in applying leading edge technology to meet and exceed increasingly complex client goals in the areas of seafloor mapping, marine geophysical surveying, geotechnical sampling and ocean engineering.


Williamson has a strong track record of successful and on-time completion of challenging marine survey, sampling and search projects. With an emphasis on high resolution seafloor imagery, bathymetry and sub-bottom profiling, Williamson utilizes a variety of hull-mounted and towed sonar systems to provide high quality geophysical data, bathymetry charts and seafloor image mosaics in support of seafloor cable and pipeline installations, geohazard surveys, small target search and a variety of other engineering and scientific investigations. In the geotechnical arena, Williamson conducts seabed resistivity and cone penetrometer sampling and seabed piston and gravity core sampling to 4-inch core diameters and 5000 pound weight stands.

Specific services include:

  • Geophysical Survey
  • Sidescan Sonar
  • Multibeam Sonar
  • Sub-bottom Profiling
  • Magnetometer Survey
  • Target Search and Location
  • Core Sampling
  • Induced Polarization Techniques in Detecting and Classifying Seabed Sediments
  • Desk Top Studies
  • Geophysical Reports
  • Induced Polarization
  • DGPS and USBL Positioning
  • Land Surveying
  • C-BASS Resistivity
  • CPT Soil Penetration Testing