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The borehole source BIS-SV generates vertically polarized shear waves (SV) in dry or water filled boreholes. The BIS-SV source can be used with the impulse generators IPG800 or IPG5000. The coupling to the borehole wall is ensured by a pneumatic clamping system (inflatable bladder). The source is designed for seismic crosshole applications. No special alignment of the source is required in the borehole. A switch box is provided to select one of the two SV shot directions “UP” and “Down” which improves the practicability of the S-wave source. In combination with the P-wave sparker source (SBS42) and the SH-wave source (BIS-SH) P-, SH- and SV-waves can be measured and used for a comprehensive characterization of soil mechanical parameters. SV velocities together with SH velocities can be used to evaluate the soil stress history. Together with P-waves, a joint inversion can be done to analyse the anisotropic properties of soils.

              Technical Details                                      

             Generated wave types: SV

             Signal frequencies: Up to 500 Hz

             (depending on geology and borehole distance)

             Operational depth: Up to 100 m

             Source length: 1015 mm

             Source weight: 6 kg

             Cable weight per metre: 377 g

             Borehole diameter: 75-100 mm (or larger if spacers are used)

             Clamping system: Inflatable bladder

             Depth indicator: Cable marking every 2m

             Connector: To impulse generator IPG800 or IPG5000

             Storage: On drum

             Switch box: Switch between two vertical shot directions