SEISMIC CROSS-HOLE SET
The seismic cross-hole set is a set of borehole survey instruments specially designed for accurate geophysical investigation of the subsurface by measuring seismic compression and shear waves.
SET
CROSS HOLE
The Cross-Hole test consists of the direct measurement of seismic compression (P) and shear (Sv) waves travelling horizontally in the subsurface.
Two specific borehole seismic sources are used to generate seismic waves.
One or more specific receivers are used to detect the arrival of the seismic wave in the borehole; the distance between the boreholes at different measuring depths is obtained by performing an inclinometer survey with Inclis DH probe.
The velocity of the seismic wave P or S is obtained from the distance to travel time ratio.
One or more specific receivers are used to detect the arrival of the seismic wave in the borehole; the distance between the boreholes at different measuring depths is obtained by performing an inclinometer survey with Inclis DH probe.
The velocity of the seismic wave P or S is obtained from the distance to travel time ratio.
Applications
- Seismic cross-hole with 2 or 3 holes
- Seismic tomography
- Estimating the elastic modules of soils and rock masses
- Locating cavities
- Water table depth
Civil


Foundation
works
works


Characterization
of soils and rock masses
of soils and rock masses



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P WAVESSOLGEO SPARKER is an automatic source used to generate P-waves; it operates at different power levels (from 100J to 300J) guaranteeing frequency contents from 100 Hz up to 6kHz; it must be used in holes filled with water.
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S WAVESSOLGEO GEOSv is used to generate S-waves. The device allows to automatically produce both upwards and downwards signals to obtain an inversion of the shear waves polarization without P waves noise.
The Solgeo AVG (Amplified Vertical Geophone) is the paired receiver. The clamping is obtained with pneumatic device.