Subsurface Imaging

• SSI Capability

  Surface Surveys
  Crosshole Surveys
  Crosshole Shearwave surveys

  The seismic refraction method measures the travel time of seismic waves travelling along subsurface layers. A Shot or source, at surface or downhole provides the energy. Energy radiates out from the shot point, either travelling directly This energy is detected on surface using a linear array of geophones or downhole using an array of phone or a single multi-component phone. Processing this data gives the seismic velocities.

Surface Seismic Refraction Survey

USE of P and S wave surveys for FOUNDATION DESIGN

The building codes give an opportunity to use shear wave velocities to determine foundation types.

This is an example of using the method

A Schematic of a typical Crosshole survey setup, either bore to bore or surface to downhole

Another way to get information is to use a slowness image or tomographic Image. SSI also have the capability to do this with Resistivity, Bore Radar or Radio Tomography.