On the relation between seismic interferometry and the simultaneoussource method

In seismic interferometry the response to a virtual source is created from responses to sequential transient or simultaneous noise sources. Most methods use crosscorrelation, but recently seismic interferometry by multidimensional deconvolution (MDD) has been proposed as well. In the simultaneous-source method (also known as blended acquisition), overlapping responses to sources with small time delays are recorded. The crosstalk that occurs in imaging of simultaneous-source data can be reduced by using phase-encoded sources or simultaneous noise sources, by randomizing the time interval between the shots, or by inverting the blending operator. Seismic interferometry and the simultaneous-source method are related. In this paper we make this relation explicit by deriving deblending as a form of seismic interferometry by MDD. Moreover, we discuss a deblending algorithm for blended data acquired at the surface.