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Subsurface Geophysical Surveys

Shallow Underground Surveys and Non-Destructive Evaluation



Seismic Reflections Surveys

Seismic Refraction and MASW Shear-Wave Velocity Profiling

Ground-Penetrating Radar Investigations

Other Projects


Technical Info and Links to Other Sites



Subsurface Geophysical Surveys

The following provides a summary of the more common subsurface geophysical survey techniques we perform primarily for geological investigations.  Below each is a listing of specific applications with some example data displays.

Seismic Reflection Surveys

  • Investigation of Subsurface Faulting view example  

  • Investigation of Landslide Rupture Surfaces view example

  • Subsurface Profiling for Investigation of Tunnel and Horizontal Drilling Pathways view example

  • Mapping of Basin Structure and Stratigraphy for Groundwater Studies view example

  • Mapping of Distribution and Thickness of Economic Units view example

  • General Exploration of Deeper Subsurface Geology view example

Seismic Refraction Surveys                                                              

  • Investigation of Shallow Faulting view example

  • Investigation of Bedrock Structure and Velocity for Rippability view example

  • Subsurface Profiling of Alluvial Channels and Groundwater Conditions view example           

  • General Investigation of Shallower Subsurface Geology

Seismic Shear-Wave Velocity Surveys- Using Multi-Channel Analysis of Surface Waves (MASW) Method

  • Investigation of Shear-Wave Velocity Profile for Earthquake Hazard Studies view example          

  • Investigation of Shallow Bedrock Depth Profile view example

  • General Investigation of Lithologic Conditions in Alluvium view example

Crosshole and Downhole Seismic Surveys- Using P and S-Wave Energy Sources

  • Investigation of Vp and Vs Velocity Profiles for Earthquake Hazard Studies view example

  • Investigation of Geologic Conditions Beneath Structures- Using Crosshole Tomography

  • Correlation of Borehole Lithology to Seismic Reflection- Using Downhole or Vertical Seismic Profiles 

Electrical Resistivity Profiling- Using DC and Transient EM Methods

  • Investigation of Groundwater Conditions view example

  • Mapping of Saline Groundwater Layers

  • Investigation of Subsurface Cavities and Voids

  • Investigation of Soil Resistivity for Deeper Pipeline Corrosion Studies

  • General Investigation of Subsurface Geology

Ground-Penetrating Radar 2D and 3D Surveys

  • Investigation of Near-Surface Faulting and Fracturing in Bedrock

  • Investigation of Subsurface Cavities and Voids

  • Investigation of Landfills, Burial Pits and Previous Excavations

  • Investigation of Water Table Beneath Sandy Alluvium 

  • Exploration of Conductive Ore Bodies

  • Investigation of Geologic Conditions Beneath Structures- Using Crosshole Radar Tomography

Electromagnetic and Magnetic Multi-Sensor Surveys

  • Exploration of Near-Surface Groundwater

  • Mapping of Near-Surface Conductive Clay Layers

  • Mapping of Bedrock Contacts and Ferrous Units- Using Contrasts in Rock Magnetization

  • Investigation of Landfills, Burial Pits and Previous Excavations

  • Exploration of Conductive and Magnetic Ore Bodies

Borehole Geophysical Log Interpretation

  • General Investigation of Subsurface Geology

  • Investigation of Subsurface Bedding Structure for Landslide Investigations

  • Investigation of Groundwater Conditions