Applications of seismic interferometry to seismic field data

In seismic interferometry one extracts the Green’s function of a system from fluctuations in the system. This makes it possible to retrieve the waves that propagate between receivers, as if one of the receivers acts as a source. Examples are presented of this principle to field data. One can show that in seismic interferometry one can retrieve the Green’s function that has different boundary conditions than the physical system has. It is shown how this can be used to unravel the building response from its coupling to the subsurface, and how this principle can be exploited to suppress surface-related multiples in marine seismics. As another example, we present the propagation of P-wave and S-waves down a vertical borehole extracted from incoherent man-made noise, and how shear-wave splitting can be extracted from these measurements. Finally we show how drill-bit noise can be used for imaging when the vibrations in the drill stem have not been recorded.