Near Surface Geophysics > VSP with a hydrophone at well C1

For near surface vertical seismic profile, slim hole VSP tools and light seismic sources are usually used. In the previous example, we have seen VSP data recorded with geophones as sensors. Here we present VSP data recorded with hydrophone as sensor.

The hydrophone VSP has been recorded at well C1 on the Hydrogeological Experimental Site of the University of Poitiers. The example shows how wavenumber filter and velocity filter in the f, k domain can be combined to separate the different wave fields. It also shows how the Hilbert transform and the analytic signal can be used to analyze the amplitude of the different waves.

Figure shows step by step :

  • Step 1: the site and the location of the well C1.

  • Step 2: the VSP tool. It is a borehole hydrophone.

  • Step 3: the seismic source. It is a light weight dropper.