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Geolinks​
Technology​
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The Geolinks story truly began in 2019 when CNRS researcher Christophe Voisin met with the co-founding team of Geolinks.​

The novel monitoring technology was initially developed to enhance earthquake aftershock prediction.

The novel process enabled to transform natural seismic ambient noise into 3D visualization of deep underground CO2 rich fluid circulation…​

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Coherency analysis using​
Cross-correlated Waves​
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This innovative method has been developed and tested in the context of earthquake hazards in the CNRS-ISTERRE laboratory in Grenoble (France).

The inventor of the method is Christophe Voisin who is a CNRS researcher, and serves as the Geolinks scientific advisor.

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How does it work?​
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Energy loss Distance in Km

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Did you know?​
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Passive seismic was mostly used to monitor the development of stress in the formation in order to prevent induced seismicity (microseismic method).

The Rayleigh waves are more sensitive to saturation change than commonly used reflected waves, because the Rayleigh waves are integrating waves.

Use of Rayleigh waves does not require dense seismic arrays since they can detect objects at the fraction of the seismic wavelength

Surface waves can be easily reconstructed from the ambient noise, so they don’t require to mobilize seismic sources (passive seismic).

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The 5 top questions our clients are asking about CCW…​
and our answers!​
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What are the seismic waves you are using with the waveform coherency analysis?
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We use the surface waves (Rayleigh waves). If you want to know why we prefer to monitor with those waves, please feel free to contact us.

What is the lowest and highest frequency that can be analyzed with the method?
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When using the conventional sensors, 5Hz, or 10Hz, there is no limitation on the high end. On the low end, we can analyze data within a frequency range of around 0.4 Hz and above….and if you want to know how investigation depth varies with surface waves frequencies, please feel free to contact us.

What is the spatial resolution of the method?
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The spatial (or lateral) resolution of the technique is limited by the spatial density of the sensors within the seismic array. Typical spatial density of a seismic array used for a leak detection at 500 meters depth, is between 1 to 5 sensors per Km2.
Do you need specific sensors when monitoring with CCW?
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Any type of sensors, in well or on water bottom, geophones 5Hz, 10Hz, hydrophone, broadband seismometers, velocimeter, accelerometer, DAS.
Can you use the CCW method onshore and offshore?
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Yes! The CCW method can be applied in any context, as long as we can record the ambient noise.