ABSTRACT

Seismic interferometry provides tools for redatuming physical data to a receiver or event location. Placing a virtual source close to a structure of interest yields many benefits for imaging. For example, it allows to mitigate the effect of velocity uncertainty in the overburden. Here, we consider the problem of estimating the Green''s function between two earthquakes located inside a subducted slab using earthquake data recorded at the surface. Our primary focus is to obtain an accurate time-image of a subducted interface. Known techniques, such as classical or source-receiver interferometry, are not directly applicable due to inadequate acquisition geometry. We propose a two-step kinematically correct redatuming procedure that first redatums the data from earthquakes below the subducted interface to the surface via classical interferometry, and then utilizes source-receiver wavefieled interferometry to redatum virtual surface seismic data to the location of a particular earthquake event.

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