• Set Cross Hole Sismico 01

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.
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
Download
the data sheet
Request
a quote
Civil
Foundation
works
Characterization
of soils and rock masses
  • P WAVES
    SOLGEO 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.
  • S WAVES
    SOLGEO 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.
CROSS HOLE
GEOSv
GEOSv Borehole source of SHv
GEOSv is the revolutionary and unique source specifically designed for shear wave generation. Equipped with a pneumatic quick-lock system, it generates vertical polarised shear waves.
This device is fully compliant with the international ASTM D7400-08 verification standard, should be ASTM D4428.
Product plus
  • Lightweight, strong and easy to use
  • Vertical upward and downward shear waves
  • No need for orientation
  • Pneumatic locking system
Application
  • Vertically polarised shear waves generation
Technical Characteristics
Diameter65 mm
Length650 mm
Maximum depth200 m
Maximum air pressure25 bar
Air hose connection 6 mm
Maximum piston excursion21 mm
Connector7-pin high voltage
Housing materialAluminium
Clamping pistons2
SupplyMax 3000 V 200 J
Frequency bandwidth100-600 Hz
CROSS HOLE
SHOCK
SHOCK Borehole source of SH
The borehole source SHock is utilized to generate pressure (P-) and shear waves of horizontal polarization (SH-waves) in wells while performing the operations through crosshole seismic testing (CST) and reverse vertical seismic profiling (RVSP) methods.
The power supply Jack is used as the source of energy. The source generates a transverse wave through an asymmetric blow delivered into the wall of the well. A rigid pneumo-electric line makes it easy to rotate the source in the borehole, providing generation of “right” and “left” blows. The SHock source allows excitation of seismic signals in both water-filled and dry wells, which is not feasible for borehole sparkers. SHock is supplied on a reel equipped with a high-voltage slip ring. Thus, one does not need to disconnect the power supply during operations of winding / unwinding the cable.
Application
  • Cross-hole: shear waves horizontal polarized
Technical Characteristics
Operating voltageUp to 6000 V
Operating energyUp to 1500 J
Well diameters70 - 140 mm
Diameter65 mm
Length970 mm
Dimensions on a reel570 x 550 x 650 mm
Weight with a reel and a 130 m pneumo-electric line93 Kg
CROSS HOLE
Borehole Sparker
in mono electrode version
Power supply Jack generates a short high-voltage electric pulse of considerable energy that ensures the formation of ionized high-pressure gas-vapor cavities on the electrode group of the Pulse sparker, placed in a container with salt water.
The set includes
  • Titan source
  • Power cable
Products plus
  • Operating energies up to 300 J
  • Easily replaceable electrode assembly
  • Can be used in wells with a minimum diameter of 60mm
Application
  • Cross-hole: compression P-waves
Details
With explosive expansion of the gas-vapor cavity, the pressure in it rapidly decreases, which leads to a precipitate drop in the temperature, vapor condensation and subsequent collapse of the cavity, which does not lead to parasitic pulsations.

The design of the source provides easy replacement of wear electrode groups, which also allows control of the signature of the source by installing a group with a different number of electrodes. The standard diameters of the containers are 36 / 60 / 80 mm, thus allowing operations in wells with diameters starting from 40 mm. It is important to understand that in order to provide a stable pulse of high energy and a significant operational life of the radiating group, a sufficient volume of the container and the amount of electrodes greater than 25 are necessary. The operating life of the radiator is 5000÷50000 excitations and depends on the number of electrodes and the energy supplied to them. Pulse sources are shipped on geophysical reels equipped with high-voltage slip rings. This means there is no need to disconnect the source from a power supply during cable winding/unwinding operations.
Technical Characteristics
MONO
Operating voltageUp to 3000 v
Operating energyUp to 300 J
Well diametersFrom 60 mm
Diameter50 mm
Length750 mm
Dimensions on a reel600 x 500 x 460 mm
Weight with a reel and a 100 m cableApprox. 53 Kg
CROSS HOLE
JACK
Jack Pulsed power supply
Power supplies Jack ensure the operation of sparker and electrodynamic sources used in geophysical surveys in boreholes by methods of cross-hole seismic testing (CST), vertical seismic profiling (VSP), vertical seismic acoustic profiling (VSaP) and others. The Jack design uses a reliable thyristor key, which allows for a very short high-voltage electrical pulse.
The power supply is operated from a system with 110 / 220 V voltage. In Jack-500 and Jack-1200 models, pulse chargers provide an average charge rate of 500 J/s. The Jack-2500 HP version is equipped with a fast charger that is capable of regulating the charging speed (500 / 1000 / 1500 J/s). Thus, all Jack power supplies allow operation with compact portable generators (with power of 0,8 kW and more).
Product plus
  • High charging rate
  • Can control power consumption
  • Have remote control unit
  • Compact device
Application
  • Seismic cross-hole
  • Marine seismic
  • Dam tomography
Details
Jack power supplies allow one to work with three triggering modes:
  • triggering from an external device (seismic station, synchronization system, etc.)
  • a series with a given number of pulses and a period of their repetition
  • infinite series of pulses with a given period.
JackPad
Power supplies Jack can be equipped with a portable remote-control unit JackPad.
Compact dimensions, impact-resistant leakproof casing, light weight, well-conceived and intuitive user interface, remote control unit, allow to consider Jack power supplies as the most modern and truly mobile devices among all the analogues available on the market.
CROSS HOLE
TITAN
Seismic Energizer
Specifically designed to provide pulses to Geos and Sparker probes. Simple user interface for setting various operating modes. Integrated control of vertical shear wave polarity (when used with GEOS).
Technical specifications
PARAMETERVALUE
Power supply voltage110-220Vac 50Hz/60Hz, 300 VA
Output voltageFrom 1000 to 4000 Vdc
Energy Dda 50 a 300J, impostabile da menù. 500J opzionale a richiesta
Charging speed~100J/second
Discharge systemSolid-state module with thyristor array
Trigger modesAutomatic: number of pulses and rate configurable, trigger signal available on BNC output.
External: BNC input for external trigger from other instruments.
Pulse polarityIntegrated selector for vertical shear wave polarity (up or down)
Dimensions502 x 415 x 246 mm
Weight14 kg