The borehole source BIS-SV generates vertically polarized shear waves (SV) in dry or waterfilled boreholes. The BIS-SV source can be used with the impulse generators IPG800 or IPG5000. The coupling tothe boreholewall is ensured by a pneumatic clampingsystem (inflatable bladder).The source is designedfor 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