- Obtain Vs values of rock and soils at a point surrounding a borehole
- Multiple boreholes (up to 4) can be cross measured to create a 2D or 3D profile
- Used in areas where surface access is restricted
- Full Waveform Sonic which measures rock strength highly accurately
- Very deep studies for mine sites, up to 300 meters
- Sometimes used to verify geotechnical models
- High resolution crosshole profiles between two boreholes detect extents of voids or other hidden features