Brantax - engineering survey

underwater, underground
and surface investigation

Seismic prospecting – HVSR

Seismic prospecting method HVSR (Horizontal-to-Vertical Spectral Ratio) consists in recording the vibrations produced by ambient noise in three directions for a few minutes to determine the fundamental resonance frequency. To apply this method is used a single geophone especially designed for this purpose.


Estimating sediment thickness deposits and bedrock geometry is an essential component in numerous geological and hydrogeological studies. Some studies do not require or do not help pay for the acquisition of high resolution so would benefit from using HVSR method, the low cost with a solid estimate of the thickness of sediments and bedrock depth at a point.