Coherency analysis using
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.
How does it work?
Energy loss Distance in Km
Did you know?
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).
The 5 top questions our clients are asking about CCW…
and our answers!
What are the seismic waves you are using with the waveform coherency analysis?
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?
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?
Do you need specific sensors when monitoring with CCW?
Can you use the CCW method onshore and offshore?
Yes! The CCW method can be applied in any context, as long as we can record the ambient noise.