SEISMIC

GEOPHONE

Geophone used in geophysics is sensor designed to detect ground movements or seismic waves. The sensitive element is similar to a microphone, but capable of detecting even very low frequencies (up to 1 or 2 Hz) and transforming the detected signal into an electrical impulse. In fact, an electromagnetic geophone generates a current when the arrival of the seismic wave, artificially produced in the ground by a controlled seismic source or spontaneously produced by a natural or anthropic source, determines the relative motion of a coil inside a magnet. This current is transmitted to the seismograph, which displays and records the seismic waves arriving from multiple sensors, arranged along a line.

Different methods of seismic investigation have been developed in order to provide information on soil stratigraphy, its density and on the elastic properties of the subsoil. These include the use of geophones with different characteristics and frequencies. Both vertical and horizontal sensors are used to capture and reconstruct the different components of the seismic wave itself, as well as a group of 3 sensors oriented along a set of Cartesian axes (3D surface geophones and 3D borehole geophones).

Each sensor is placed in a robust shell (or case) and equipped with a rod that allows it to be driven into the ground. Alternatively, special bases are available for use on asphalt and other rigid substrates. 3D geophones (also known as 3C or "3-component” geophones) find space inside special housings suitable for use on the surface or in the borehole.

  Applications > seismic refraction, refraction tomography 
Vertical 10Hz geophone

Vertical 10Hz geophone

 

In standard shell, 75mm steel rod, 1m cable terminated with split spring connector (single clip).
For use on asphalt and rigid surfaces, we recommend using it with a special universal base (to be ordered separately).

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horizontal 10Hz geophone

 

In horizontal shell with bubble level, 75mm steel rod, 1m cable terminated with split spring connector (single clip).
For use on asphalt and rigid surfaces, we recommend using it with a special universal base (to be ordered separately).

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  applications -> masw, re.mi. surface waves, refraction

Vertical 4.5Hz geophone

 

In standard shell, 75mm steel rod, 1m cable terminated with split spring connector (single clip).
For use on asphalt and rigid surfaces, we recommend using it with a special universal base (to be ordered separately).

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Horizontal 4.5Hz geophone

 

In horizontal shell with bubble level, 75mm steel rod, 1m cable terminated with split spring connector (single clip).
For use on asphalt and rigid surfaces, we recommend using it with a special universal base (to be ordered separately).

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  applications -> seismic reflection

Vertical 40Hz geophone

 

In standard shell, 75mm steel rod, 1m cable terminated with split spring connector (single clip).
For use on asphalt and rigid surfaces, we recommend using it with a special universal base (to be ordered separately).

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Vertical 50Hz/100Hz geophone

 

In standard shell, 75mm steel rod, 1m cable terminated with split spring connector (single clip) (to order).
For use on asphalt and rigid surfaces, we recommend using it with a special universal base (to be ordered separately).

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 applications -> hvsr, vibrations

3dlg-2 - 2Hz

 

3D Land Geophone with 2Hz high-sensitivity sensor triad mounted in a robust waterproof container with bubble level. Complete with shockproof carrying case, calibration certificate, 3 rods for use on the ground + 3 adjustable rods for use on asphalt/rigid surfaces.

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3D land geophone

 

2Hz and 4.5Hz - sensor triad in standard 3C shell with bubble level and 3 steel 75mm rods, 1m of cable terminated with 3x single “split spring” for seismic cable (version available upon request with Cannon connector for direct connection to the seismograph).

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  applications -> downhole-crosshole seismic acquisition

GFA-50/100

 

Borehole 3D Geophone Mod. GFA 50/100 is built with 3 high-sensitivity geophones (nat.freq.10 Hz- 1 vertical and 2 horizontal sensors) oriented according to a triad of orthogonal Cartesian axes XYZ. Supplied with a cleat assembly to sustain its weight at the requested depth (GFA cable is graduated in meters), this borehole geophone has a pneumatic-mechanical clamping system with lateral lever and spacer block.

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summary table of geophones features

summary table of geophones features