Seismic Interferometry: reconstructing the Earth's reflection response

Can the reflection response of the subsurface be obtained without the need to place an active source at the surface? Using numerical modeling results based on one-way wavefields, we show that the reflection response of a 3-D inhomogeneous lossless medium can be reconstructed from the crosscorrelation of its transmission response at the surface. Depending on the type of subsurface noise sources, we can do this using two di#erent procedures. When we can record distinct transmission response from each subsurface source, we first crosscorrelate the traces in each shot gather with a master trace from the same gather, then we resort the traces to common receiver gather and sum the traces in each receiver gather. When we can not make separate transmission recordings from the noise sources, but rather record their superposition, then assuming the sources to be uncorrelated in time we directly correlate the transmission panel with a master trace. The simulated reflection response reconstructs not only the kinematics, but also the amplitudes of the events